1. Serrería 2 Health Center, Valencia, Spain
2. Health Surveillance Center, Mutuas Union, Castellón, Spain
3. Clinical Research Department, Merck Sharp & Dohme de España, Madrid, Spain
4. Ingeniero Joaquín Benlloch Health Center, Valencia, Spain
5. Research Unit, Hospital Clínico San Carlos, Madrid, Spain
6. San Antonio Health Center, Motril, Spain
7. Research Unit, Hospital Marina Alta, Denia, Spain
8. Clinic Department. Miguel Hernandez University, Alicante, Spain
9. Hypertension Clinic, Hospital Clínico Universitario, Valencia University, Spain.