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© 2016 SOCIEDADE PORTUGUESA DE GASTRENTEROLOGIA This journal and the individual contributions contained in it are protected under copyright, and the following terms and conditions apply to their use in addition to the terms of any Creative Commons or other user license that has been applied by the publisher to an individual article: Photocopying. Single photocopies of single articles may be made for personal use as allowed by national copyright laws. Permission is not required for photocopying of articles published under the CC BY license nor for photocopying for non-commercial purposes in accordance with any other user license applied by the publisher. Permission of the publisher and payment of a fee is required for all other photocopying (in this case you should contact with CEDRO [www.cedro.org]). Derivative Works. Users may reproduce tables of contents or prepare lists of articles including abstracts for internal circulation within their institutions or companies. Other than for articles published under the CC BY license, permission of the publisher is required for resale or distribution outside the subscribing institution or company. For any subscribed articles or articles published under a CC BY-NC-ND license, permission of the publisher is required for all other derivative works, including compilations and translations. Storage or Usage. Except as outlined above or as set out in the relevant user license, no part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without prior written permission of the publisher. Author rights. Author(s) may have additional rights in their articles as set out in their agreement with the publisher (more information at http://www.elsevier.com/authors- rights). No responsibility is assumed by the Publisher or the SOCIE- DADE PORTUGUESA DE GASTRENTEROLOGIA for any injury and/or damage to persons or property as a matter of pro- ducts liability, negligence or otherwise, or from any use or operation of any methods, products, instructions or ideas contained in the material herein. Although all advertising material is expected to conform to ethical standards, inclusion in this publication does not cons- titute a guarantee or endorsement of the quality or value of such product or of the claims made of it by its manufacturer. Sociedade Portuguesa de Gastrenterologia Av. António José de Almeida nº 5F - 8º andar 1000-042 Lisbon, Portugal http://www.spg.pt Published every 2 months (6 issues per year). www.elsevier.pt/ge Indexed by Index RMP, SciELO Portugal (Thomson Reuters) and Scopus Reprint information: Clarissa Felix: [email protected] Subscription of printed version available One issue 10,00 € (VAT not included) Anual 55,00 € (VAT not included) (prices valid only for Portugal) Subscriptions orders: [email protected] Av. Josep Tarradellas, 20-30, 1º 08029 Barcelona (Spain) Phone: +34 932 000 711 Zurbano, 76, 4º Izq. 28010 Madrid (Spain) Phone: +34 914 021 212 Data protection: Elsevier España, S.L.U. declares that it complies with that established by Organic Law 15/1999, 13 December, Protection of Personal Data ISSN: 2341-4545 Register 117.866 of Gabinete para os Meios de Comunicação Social Printed in Portugal Printipo: [email protected] Print run 1000 copies Legal deposit: 91402/95 See our Publication Ethics and Malpractice Statement in https://www.elsevier.com/editors/publishing-ethics Editorial Board Ana Caldeira Unidade Local de Saúde de Castelo Branco, Castelo Branco, Portugal Angelo Alves de Mattos Universidade Federal de Ciências da Saúde de Porto Alegre/Hospital Santa Casa de Misericórdia de Porto Alegre, Porto Alegre, Brazil Arjun Koch Erasmus MC University Medical Center, Rotterdam, Netherlands Bruno Rosa Centro Hospitalar do Alto Ave, Guimarães, Portugal Carla Rolanda Hospital de Braga, Braga, Portugal Cesare Hassan Nuovo Regina Margherita Hospital, Rome, Italy Cristina Chagas Centro Hospitalar de Lisboa Ocidental, Lisbon, Portugal Enrique Perez Cuadrado Morales Meseguer Hospital, Murcia, Spain Fátima Serejo Centro Hospitalar de Lisboa Norte, Lisbon, Portugal F. Castro Poças Centro Hospitalar do Porto, Porto, Portugal Fernando Magro Centro Hospitalar de São João, Porto, Portugal Flávio Steinwurz Hospital Israelita Albert Einstein, São Paulo, Brazil Francisco Portela Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal Gilberto Couto Hospital da Luz, Lisbon, Portugal Guilherme Macedo Centro Hospitalar de São João, Porto, Portugal Helder Cardoso Centro Hospitalar de São João, Porto, Portugal Helena Cortez-Pinto Centro Hospitalar de Lisboa Norte, Lisbon, Portugal Isabelle Cremers Centro Hospitalar de Setúbal, Setúbal, Portugal James Buxbaum Los Angeles County Hospital, Keck School of Medicine, University of Southern California, Los Angeles, USA Joana Torres Hospital Beatriz Ângelo, Loures, Portugal João Bruno Soares Hospital de Braga, Braga, Portugal Jorge Amil Dias Centro Hospitalar de São João, Porto, Portugal Jorge Canena Hospital CUF Infante Santo, Lisbon, Portugal José Velosa Centro Hospitalar de Lisboa Norte, Lisbon, Portugal Julio Iglésias-Garcia Hospital Clínico Universitario, Santiago de Compostela, Spain Júlio Pereira Lima Universidade Federal de Ciências da Saúde de Porto Alegre/Hospital Santa Casa de Misericórdia de Porto Alegre, Porto Alegre, Brazil Klaus Monkemuller University of Alabama, Alabama, USA Emeriti Editors António Saragoça 1983 – 1993 F. Costa Mira 1994 – 1996 J. Lemos Barreiras 1995 – 1997 Mariana Machado Centro Hospitalar de Lisboa Norte, Lisbon, Portugal Marilia Cravo Hospital Beatriz Ângelo, Loures, Portugal Miguel Areia Instituto Português de Oncologia de Coimbra Francisco Gentil, Coimbra, Portugal Nuno Nunes Hospital do Divino Espírito Santo de Ponta Delgada, Ponta Delgada, Portugal Paulo Freire Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal Pedro Amaro Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal Pedro Figueiredo Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal Pedro Moutinho Ribeiro Centro Hospitalar de São João, Porto, Portugal Ricardo Marcos Pinto Centro Hospitalar do Porto, Porto, Portugal Rolando Pinho Centro Hospitalar de Vila Nova de Gaia/ Espinho, Vila Nova de Gaia, Portugal Rui Tato Marinho Centro Hospitalar de Lisboa Norte, Lisbon, Portugal Sandra Faias Instituto Português de Oncologia de Lisboa Francisco Gentil, Lisbon, Portugal Sergio Zepeda-Gomez University of Alberta, Alberta, Canada Yutaka Saito National Cancer Center Hospital, Tokyo, Japan Miguel Carneiro de Moura 1997 – 2001 Leopoldo Matos 2001 – 2003 José Velosa 2003 – 2007 António Alberto Santos 2007 – 2009 Rui Tato Marinho 2009 – 2011 Helena Cortez-Pinto 2011 – 2014 Director José Cotter Centro Hospitalar do Alto Ave, Guimarães, Portugal Adjunct Directors A. Dias Pereira Instituto Português de Oncologia de Lisboa Francisco Gentil, Lisbon, Portugal Isabel Pedroto Centro Hospitalar do Porto, Porto, Portugal Editor-in-Chief Pedro Pimentel-Nunes Instituto Português de Oncologia do Porto Francisco Gentil, Porto, Portugal Associated Editor Mário Dinis Ribeiro Instituto Português de Oncologia do Porto Francisco Gentil, Porto, Portugal Co-Editors Miguel Bispo Centro Hospitalar de Lisboa Ocidental, Lisbon, Portugal Nuno Almeida Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal Susana Lopes Centro Hospitalar de São João, Porto, Portugal Technical Advisor Helena Donato Editorial Assistant Andreia Neto e-mail [email protected]

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Page 1: © 2016 SOCIEDADE PORTUGUESA DE GASTRENTEROLOGIA ... · © 2016 SOCIEDADE PORTUGUESA DE GASTRENTEROLOGIA This journal and the individual contributions contained in it are protected

© 2016 SOCIEDADE PORTUGUESA DE GASTRENTEROLOGIA

This journal and the individual contributions contained in it are protected under copyright, and the following terms and conditions apply to their use in addition to the terms of any Creative Commons or other user license that has been applied by the publisher to an individual article: Photocopying. Single photocopies of single articles may be made for personal use as allowed by national copyright laws. Permission is not required for photocopying of articles published under the CC BY license nor for photocopying for non-commercial purposes in accordance with any other user license applied by the publisher. Permission of the publisher and payment of a fee is required for all other photocopying (in this case you should contact with CEDRO [www.cedro.org]).Derivative Works. Users may reproduce tables of contents or prepare lists of articles including abstracts for internal circulation within their institutions or companies. Other than for articles published under the CC BY license, permission of the publisher is required for resale or distribution outside the subscribing institution or company. For any subscribed articles or articles published under a CC BY-NC-ND license,permission of the publisher is required for all other derivative works, including compilations and translations.Storage or Usage. Except as outlined above or as set out in the relevant user license, no part of this publication may be reproduced, stored in a retrieval system or transmittedin any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without prior written permission of the publisher.Author rights. Author(s) may have additional rights in their articles as set out in their agreement with the publisher (more information at http://www.elsevier.com/authors-rights).No responsibility is assumed by the Publisher or the SOCIE-DADE PORTUGUESA DE GASTRENTEROLOGIA for any injury and/or damage to persons or property as a matter of pro-ducts liability, negligence or otherwise, or from any use or operation of any methods, products, instructions or ideas contained in the material herein. Although all advertising material is expected to conform to ethical standards, inclusion in this publication does not cons-titute a guarantee or endorsement of the quality or value of such product or of the claims made of it by its ma nufacturer.Sociedade Portuguesa de GastrenterologiaAv. António José de Almeida nº 5F - 8º andar1000-042 Lisbon, Portugalhttp://www.spg.pt

Published every 2 months (6 issues per year).www.elsevier.pt/ge

Indexed by Index RMP, SciELO Portugal (Thomson Reuters) and Scopus

Reprint information:Clarissa Felix: [email protected]

Subscription of printed version available One issue 10,00 € (VAT not included) Anual 55,00 € (VAT not included) (prices valid only for Portugal)

Subscriptions orders: [email protected]

Av. Josep Tarradellas, 20-30, 1º08029 Barcelona (Spain) Phone: +34 932 000 711

Zurbano, 76, 4º Izq. 28010 Madrid (Spain)Phone: +34 914 021 212

Data protection: Elsevier España, S.L.U. declares that it complies with that established by Organic Law 15/1999, 13 December, Protection of Personal Data

ISSN: 2341-4545

Register 117.866 of Gabinete para os Meios de Comunicação Social

Printed in PortugalPrintipo: [email protected]

Print run 1000 copies

Legal deposit: 91402/95

See our Publication Ethics and Malpractice Statement inhttps://www.elsevier.com/editors/publishing-ethics

Editorial Board

Ana Caldeira Unidade Local de Saúde de Castelo Branco, Castelo Branco, Portugal

Angelo Alves de Mattos Universidade Federal de Ciências da Saúde de Porto Alegre/Hospital Santa Casa de Misericórdia de Porto Alegre, Porto Alegre, Brazil

Arjun KochErasmus MC University Medical Center, Rotterdam, Netherlands

Bruno RosaCentro Hospitalar do Alto Ave, Guimarães, Portugal

Carla Rolanda Hospital de Braga, Braga, Portugal

Cesare HassanNuovo Regina Margherita Hospital, Rome, Italy

Cristina ChagasCentro Hospitalar de Lisboa Ocidental, Lisbon, Portugal

Enrique Perez CuadradoMorales Meseguer Hospital, Murcia, Spain

Fátima SerejoCentro Hospitalar de Lisboa Norte, Lisbon, Portugal

F. Castro PoçasCentro Hospitalar do Porto, Porto, Portugal

Fernando MagroCentro Hospitalar de São João, Porto, Portugal

Flávio SteinwurzHospital Israelita Albert Einstein, São Paulo, Brazil

Francisco PortelaCentro Hospitalar e Universitário de Coimbra, Coimbra, Portugal

Gilberto CoutoHospital da Luz, Lisbon, Portugal

Guilherme MacedoCentro Hospitalar de São João, Porto, Portugal

Helder CardosoCentro Hospitalar de São João, Porto, Portugal

Helena Cortez-PintoCentro Hospitalar de Lisboa Norte, Lisbon, Portugal

Isabelle CremersCentro Hospitalar de Setúbal, Setúbal, Portugal

James BuxbaumLos Angeles County Hospital, Keck School of Medicine, University of Southern California, Los Angeles, USA

Joana TorresHospital Beatriz Ângelo, Loures, Portugal

João Bruno SoaresHospital de Braga, Braga, Portugal

Jorge Amil DiasCentro Hospitalar de São João, Porto, Portugal

Jorge CanenaHospital CUF Infante Santo, Lisbon, Portugal

José VelosaCentro Hospitalar de Lisboa Norte, Lisbon, Portugal

Julio Iglésias-GarciaHospital Clínico Universitario, Santiago de Compostela, Spain

Júlio Pereira LimaUniversidade Federal de Ciências da Saúde de Porto Alegre/Hospital Santa Casa de Misericórdia de Porto Alegre, Porto Alegre, Brazil

Klaus MonkemullerUniversity of Alabama, Alabama, USA

Emeriti Editors

António Saragoça 1983 – 1993

F. Costa Mira 1994 – 1996

J. Lemos Barreiras 1995 – 1997

Mariana MachadoCentro Hospitalar de Lisboa Norte, Lisbon, Portugal

Marilia CravoHospital Beatriz Ângelo, Loures, Portugal

Miguel AreiaInstituto Português de Oncologia de Coimbra Francisco Gentil, Coimbra, Portugal

Nuno NunesHospital do Divino Espírito Santo de Ponta Delgada, Ponta Delgada, Portugal

Paulo FreireCentro Hospitalar e Universitário de Coimbra, Coimbra, Portugal

Pedro AmaroCentro Hospitalar e Universitário de Coimbra, Coimbra, Portugal

Pedro FigueiredoCentro Hospitalar e Universitário de Coimbra, Coimbra, Portugal

Pedro Moutinho RibeiroCentro Hospitalar de São João, Porto, Portugal

Ricardo Marcos PintoCentro Hospitalar do Porto, Porto, Portugal

Rolando PinhoCentro Hospitalar de Vila Nova de Gaia/Espinho, Vila Nova de Gaia, Portugal

Rui Tato MarinhoCentro Hospitalar de Lisboa Norte, Lisbon, Portugal

Sandra FaiasInstituto Português de Oncologia de Lisboa Francisco Gentil, Lisbon, Portugal

Sergio Zepeda-GomezUniversity of Alberta, Alberta, Canada

Yutaka SaitoNational Cancer Center Hospital, Tokyo, Japan

Miguel Carneiro de Moura 1997 – 2001

Leopoldo Matos 2001 – 2003

José Velosa 2003 – 2007

António Alberto Santos 2007 – 2009

Rui Tato Marinho 2009 – 2011

Helena Cortez-Pinto 2011 – 2014

DirectorJosé CotterCentro Hospitalar do Alto Ave, Guimarães, Portugal

Adjunct DirectorsA. Dias PereiraInstituto Português de Oncologia de Lisboa Francisco Gentil, Lisbon, Portugal

Isabel Pedroto Centro Hospitalar do Porto, Porto, Portugal

Editor-in-ChiefPedro Pimentel-NunesInstituto Português de Oncologia do Porto Francisco Gentil, Porto, Portugal

Associated EditorMário Dinis Ribeiro Instituto Português de Oncologia do Porto Francisco Gentil, Porto, Portugal

Co-EditorsMiguel BispoCentro Hospitalar de Lisboa Ocidental, Lisbon, Portugal

Nuno AlmeidaCentro Hospitalar e Universitário de Coimbra, Coimbra, Portugal

Susana LopesCentro Hospitalar de São João, Porto, Portugal

Technical AdvisorHelena Donato

Editorial AssistantAndreia Neto

e-mail [email protected]