Martha Lucia Alzate Posada Nurse, PhD Public Health Coordinator of the Interfaculty Ph.D. Public Health programme Universidad Nacional de Colombia, BogotÃ¡ E-mail: docisp_bog@unal.edu.co Tel: 57-1-3165000 ext.
Martha Lucia Alzate Posada Facultad de Enfermería. Universidad Nacional de Colombia. Bogotá.: E-mail: docisp_bog@unal.edu.co