[1] Quintana Roo Univ, Dept Gen Surg, Hosp Gen Reg 17, Inst Mexicano Seguro Social, Ave Politecn Manzana 1 Lote 1 Reg 509, Cancun 55750, Quintana Roo, Mexico
[2] Inst Mexicano Seguro Social, Gen Zone Hosp 30, Gen Surg, Mexico City, DF, Mexico
[3] Quintana Roo Univ, Inst Mexicano Seguro Social, Hosp Gen Reg 17, Hlth Res Dept, Ave Politecn Manzana 1 Lote 1 Reg 509, Cancun, Quintana Roo, Mexico
[4] Mexican Social Secur Inst, Med Assistant Coordinat Hlth Res, Cancun, Quintana Roo, Mexico
[5] Mexican Social Secur Inst, Family Med Unit 13, Cancun, Quintana Roo, Mexico
[6] Univ Nacl Autonoma Mexico, Dept Gen Surg, Amer British Cowdray Med Ctr IAP, Sur 136 116, Alvaro Obregon 01120, DF, Mexico
[7] Hosp Gen Tulancingo, Dept Gen Surg, Tulancingo, Hidalgo, Mexico