1 Department of Internal Medicine, Hospital Civil de Guadalajara "Fray Antonio Alcalde", Guadalajara.
2 Health Sciences University Center, Universidad de Guadalajara, Guadalajara.
3 Department of Welfare and Sustainable Development, Centro Universitario del Norte, Universidad de Guadalajara, Colotlán.
4 Department of Gastroenterology, Hospital Civil de Guadalajara "Fray Antonio Alcalde". Guadalajara.
5 Biomedical Research Unit 02, Specialties Hospital, Western National Medical Center, Mexican Institute of Social Security, Guadalajara.
6 Department of Philosophical, Methodological and Instrumental Disciplines, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara.
7 Division of Basic Health Disciplines, Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara. Jalisco, Mexico.