[1] Hosp Basico Colta Dr Publio Escobar, Guamote, Ecuador
[2] Hosp Jose Maria Velasco Ibarra, Serv Anestesiol, Tena, Ecuador
[3] Hosp Jose Maria Velasco Ibarra, Serv Cirugia Gen, Tena, Ecuador
[4] Ctr Salud Talag, Tena, Ecuador
[5] Ctr Salud Guamote, Guamote, Ecuador
[6] Junta Gen Sistema Riego PISQUE, Cayambe, Ecuador
[7] Univ Nacl Chimborazo, Riobamba, Ecuador
[8] Hosp Reg Docente Ambato, Serv Cirugia Gen, Ambato, Ecuador
[9] Hosp Gen Latacunga, Serv Ctr Quirurg, Latacunga, Ecuador
[10] Univ Catolica Cuenca, Cuenca, Ecuador