[1] Univ Veracruzana, Lab Fisiol Digest & Motil Gastrointestinal, Inst Invest Med Biol, Veracruz, Mexico
[2] Dept Gastroenterol, Lab Motil Gastrointestinal, Inst Nacl Ciencias Med & Nutricio Salvador Zubiran, Mexico City, Mexico
[3] Obes Hlth, Dept Bariatr & Metab Surg, Blvd Mar 415, ZC-94299 Veracruz, Mexico
[4] Hosp Angeles de Puebla, Clin Gastroenterol Endoscopia Digest & Motil Gastr, Puebla, Mexico
[5] Univ Autonoma Sinaloa, Ctr Invest & Docencia Ciencias Salud, Culiacan, Sinaloa, Mexico
[6] Coloproctol Hosp Angeles Lomas, Mexico City, Mexico
[7] Hosp Christus Muguerza Faro Mayab, Merida, Yucatan, Mexico
[8] UMAE Hosp Especialidades, Ctr Med Nacl Manuel Avila Camacho, IMSS Puebla, Puebla, Mexico
[9] Hosp Civil Fray Antonio Alcalde, Lab Motil Gastrointestinal, Guadalajara, Jalisco, Mexico
[10] Clin Alameda, Galicia, Spain
[11] Hosp Angeles Valle Oriente, IMSS UMAE 25, Monterrey, Nuevo Leon, Mexico
[12] Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Ciudad Mex, Mexico City, Mexico
[13] Escuela Med & Ciencias Salud, Tecnol Monterrey, Monterrey, Nuevo Leon, Mexico
[14] Lab Motil Gastrointestinal Fdn Clin Med Sur, Mexico City, Mexico
[15] Inst Nacl Ciencias Med & Nutr Salvador Zubiran, Inst Nacl Ciencias Med & Nutr <double left angle b, Mexico City, Mexico
[16] Hosp Angeles Acoxpa, Mexico City, Mexico
[17] Iturbide S-N Entre Carmen Serdan & 20 Noviembre, Veracruz, Mexico