Associations among physician advice, physical activity, and socio-demographic groups in older Spanish adults

1. Rodríguez, M.M.
2. Del Castillo, J.M.
3. Sánchez, J.A.S.
4. Jiménez-Beatty Navarro, J.E.
5. Santacruz, J.A.
6. Herráiz, A.R.