Study of the Therapeutic Effects of Intercessory Prayer (STEP): study design and research methods.
Dusek JA, Sherwood JB, Friedman R, Myers P, Bethea CF, Levitsky S, Hill PC, Jain MK, Kopecky SL, Mueller PS, Lam P, Benson H, Hibberd PL. Study of the Therapeutic Effects of Intercessory Prayer (STEP): study design and research methods. Am Heart J. 2002 Apr; 143(4):577-84.