About the Authors

Dariush Nasrollahzadeh

Affiliations Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden, Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran

Karim Aghcheli

Affiliation Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran

Masoud Sotoudeh

Affiliation Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran

Ramin Shakeri

Affiliation Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran

E. Christina Persson

Affiliation Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America

Farhad Islami

Affiliations International Agency for Research on Cancer, Lyon, France, Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran

Farin Kamangar

Affiliations Department of Public Health Analysis, School of Community Health and Policy, Morgan State University, Baltimore, Maryland, United States of America, Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America

Christian C. Abnet

Affiliation Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America

Paolo Boffetta

Affiliations The Tisch Cancer Institute and Institute for Translational Epidemiology, Mount Sinai School of Medicine, New York, New York, United States of America, International Prevention Research Institute, Lyon, France

Lars Engstrand

Affiliation Swedish Institute for Infectious Disease Control, Stockholm, Sweden

Sanford M. Dawsey

Affiliation Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America

Reza Malekzadeh

malek@ams.ac.ir (RM); weimin.ye@ki.se (WY)

Affiliation Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran

Weimin Ye

malek@ams.ac.ir (RM); weimin.ye@ki.se (WY)

Affiliation Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WY DN MS LE RM CCA SMD PB FI FK RS. Performed the experiments: DN KA MS ECP. Analyzed the data: DN. Wrote the paper: DN SD.