1. Medicine Service, Sótero del Río Hospital, Puente Alto, Chile.
2. Sótero del Río Hospital and Medicine Faculty, Pontifical Catholic University, Santiago, Chile.
3. National Center for Environmental Health, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia.
4. Environ Health Sciences Institute, Ruston, Louisiana.
5. Health Management Division, Kerr-McGee Shared Services LLC, Oklahoma City, Oklahoma.