1. Department of Family and Community Medicine, Prince Sultan Military Medical City, P.O. Box 7897, Riyadh 11159, Saudi Arabia
2. Research Unit, Family and Community Medicine Department, Prince Sultan Military Medical City, P.O. Box 7897, Riyadh 11159, Saudi Arabia
3. Al Wazarat Health Center, Prince Sultan Military Medical City, P.O. Box 7897, Riyadh 11159, Saudi Arabia
4. Training and Research Unit of Family and Community Medicine Department, Prince Sultan Military Medical City, P.O. Box 7897, Riyadh 11159, Saudi Arabia