[1] Univ San Ignacio Loyola, Vicerrectorado Invest, Lima, Peru
[2] Univ Nacl Pedro Ruiz Gallo, Fac Med Humana, Lambayeque, Peru
[3] Univ Nacl Pedro Ruiz Gallo, Fac Ciencias Biol, Lambayeque, Peru
[4] Univ Continental, Lima, Peru
[5] Hosp Reg Lambayeque, Oficina Epidemiol, Chiclayo, Peru
[6] Univ Continental, Fac Med, Huancayo, Peru