1. Institute of Maternal and Child Research, School of Medicine, University of Chile, Santa Rosa #1234, 2nd floor, Santiago, R.M., P.C. 8360160, Chile
2. Pathologic Anatomy Service, Clínica Las Condes, Estoril #450, Las Condes, R.M., P.C. 7591046, Chile
3. Urology Department, José Joaquín Aguirre Clinical Hospital, School of Medicine, University of Chile, Av. Santos Dumont #999, Independencia, R.M., P. C. 8380456, Chile
4. Urology Department, Clínica Las Condes, Estoril #450, Las Condes, R.M., P.C. 7591046, Chile
5. Urology Department, San Borja Arriarán Clinical Hospital, Santa Rosa #1234, Santiago, R.M., P.C. 8360160, Chile