1. Department of Gastroenterology, National Medical Center “20 de Noviembre”, ISSSTE, Mexico City, Mexico
2. Liver Research Unit, Medica Sur Clinic Foundation, Mexico City, Mexico
3. Faculty of Medicine, National Autonomous University of Mexico, Mexico City, Mexico
4. Department of Pathology, Medica Sur Clinic Foundation, Mexico City, Mexico
5. Department of Gastroenterology, General Hospital of Northern Theater Command (formerly General Hospital of Shenyang Military Area), Shenyang, Liaoning, China (mainland)