1. Investigation Unit, Madrid Health Service; Játiva Nº23 2ºc Madrid Spain 28007
2. CIBER Epidemiología y Salud Pública (CIBERESP) - Universitat Autònoma de Barcelona; Iberoamerican Cochrane Centre - Biomedical Research Institute Sant Pau (IIB Sant Pau); Barcelona Catalunya Spain 08041
3. Madrid Health Service; Health Center San Cristóbal; Benimamet 24 Madrid Spain 28021
4. Madrid Health Service; Centro de Salud Buenos Aires; Pio Felipe Madrid Spain 28038
5. Madrid Health Service; Centro de Salud Mirasierra; C/ Mirador de la Reina nº 117 Madrid Spain 28035
6. Madrid Health Service; Centro de Salus San Andrés; Alberto Palacios, nº 22 Madrid Madrid Spain 28021
7. Madrid Health Service; Primary Care; Llano Castellano Av. number 3 Centro de Salud Virgen de Begoña Madrid Madrid Spain 28034
8. Madrid Health Service; Centro de Salud Jaime Vera; Av. España Madrid Spain 28822
9. Madrid Health Service; EAP Ramon y Cajal; Jabonería 67 Madrid Spain 28921
10. Madrid Health Service; CS Tres Cantos; Barquillo 25, piso 2 E Madrid Spain 28004