[1] Univ Norbert Wiener, South Amer Ctr Educ & Res Publ Hlth, Lima 15046, Peru
[2] Hosp Reg Lambayeque, Oficina Epidemiol, Chiclayo 14012, Peru
[3] Univ Lima, Fac Ciencias Empresariales & Econ, Carrera Negocios Int, Lima 15023, Peru
[4] Hosp Cayetano Heredia, Serv Gastroenterol, Piura 20002, Peru
[5] Univ Nacl Piura, Escuela Med, Piura 20002, Peru
[6] Univ Nacl Piura, Soc Cient Estudiantes Med, Piura 20002, Peru
[7] Univ Continental, Escuela Med, Lima 15046, Peru
[8] Univ San Ignacio Loyola, Unidad Invest Generac & Sintesis Evidencias Salud, Lima 15024, Peru
[9] Univ San Ignacio Loyola, Escuela Posgrad, Lima 15024, Peru
[10] Univ Alberta, Fac Pharm & Pharmaceut Sci, Edmonton, AB T6G 2H1, Canada
[11] Asociac Med Invest & Serv Salud, Lima 15063, Peru
[12] Univ Privada San Juan Bautista, Escuela Profes Med Humana, Filial De Ica 11004, Ica, Peru