References: Wikipedia
Benson H, Dusek JA, Sherwood JB et al. (April 2006). "Study of the Therapeutic Effects of Intercessory Prayer (STEP) in cardiac bypass patients: a multicenter randomized trial of uncertainty and certainty of receiving intercessory prayer". American Heart Journal 151 (4): 934–42. doi:10.1016/j.ahj.2005.05.028. PMID 16569567. Lay summary (PDF) – John Templeton Foundation
O'Laoire, S (1997). "An experimental study of the effects of distant, intercessory prayer on self-esteem, anxiety, and depression". Altern Ther Health Med 3 (6): 38–53. PMID 9375429.