Poonrut Leyatikul. (2000) Factors related to primary hypertension in the elderly. Mahidol University,:ม.ป.ท.Poonrut Leyatikul. 2000. Factors related to primary hypertension in the elderly. ม.ป.ท.:Mahidol University,;Poonrut Leyatikul. Factors related to primary hypertension in the elderly. ม.ป.ท.:Mahidol University, 2000. Print.