Wagner Narciso de Campos, Juliana Doblas Massaro, Eduardo Antônio Donadi, Division of Clinical Immunology, Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14048-900, Brazil
Eduardo Luiz Rachid Cançado, Department of Gastroenterology, Clinical Gastroenterology and Clinical Hepatology of Clinical Hospital, University of São Paulo School of Medicine, São Paulo 01329-000, Brazil
Cláudia Emília Vieira Wiezel, Aguinaldo Luiz Simões, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14048-900, Brazil
Andreza Correa Teixeira, Fernanda Fernandes de Souza, Ana de Lourdes Candolo Martinelli, Division of Gastroenterology, Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14048-900, Brazil
Celso Teixeira Mendes-Junior, Departamento de Química, Laboratório de Pesquisas Forenses e Genômicas, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto 14040-901, Brazil
Author contributions: de Campos WN and Massaro JD contributed equally in the production of the paper; Campos WN performed all experiments and statistical analysis, wrote the final manuscript; Massaro JD wrote the initial project, standardized HLA-HFE procedures, performed the statistical analysis, helped on the writing of the final manuscript; Cançado ELR selected and provided patients; Wiezel CEV performed cloning experiments for defining HFE alleles; Simões AL provided facilities to perform the HFE cloning experiments; Teixeira AC selected and provided patients; Souza FF selected and provided patients; Mendes-Junior CT helped on statistical analyses; Martinelli ALC responsible for the outpatients followed-up at gastroenterology clinics; Donadi EA mentor of the research, provided financial support, technical facilities and performed final review.
Supported by: “Conselho Nacional de Desenvolvimento Cientifico e Tecnologico”(CNPq, Brazil), No. 304931/2014-1 and No. 148638/2010-4.
Institutional review board statement: This study was approved by the local Ethics Research Committee, process number HCRP 4822/2011. The samples are deposited in the Bank of Samples of the Nucleus in Research in Immunogenetics (BAMPI), process number HCFMRP 3530/2007, under the coordination of Eduardo Antônio Donadi, and in the Bank of Samples HCFMRP 3416/2003, under the responsibility of Ana de Lourdes Candolo Martinelli.
Informed consent statement: All individuals gave their informed consent to participate in the study.
Conflict-of-interest statement: The authors declare that there are no competing interests associated with the manuscript.
STROBE statement: The STROBE Statement has been adopted.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Corresponding author: Eduardo Antônio Donadi, MD, PhD, Associate Professor, Division of Clinical Immunology, Department of Medicine, Ribeirão Preto Medical School, University of São Paulo, Avenida Bandeirantes 3900, Monte Alegre, Ribeirão Preto 14048-900, Brazil. firstname.lastname@example.org
Telephone: +55-16-36022566 Fax: +55-16-36020229
Received: December 8, 2018
Peer-review started: December 10, 2018
First decision: January 5, 2019
Revised: January 17, 2019
Accepted: January 26, 2019
Article in press: January 26, 2019
Published online: February 27, 2019