Primary prevention of hypertension: clinical and public health advisory from The National High Blood Pressure Education Program - Whelton, P K; He, J; Appel, L J; Cutler, J A; Havas, S; Kotchen, T A; Roccella, E J; Stout, R; Vallbona, C; Winston, M C; Karimbakas, J (JAMA, 2002)