Fish oil and postoperative atrial fibrillation: the Omega-3 Fatty Acids for Prevention of Post-operative Atrial Fibrillation (OPERA) randomized trial. - Mozaffarian D; Marchioli R; Macchia A; Silletta MG; Ferrazzi P; Gardner TJ; Latini R; Libby P; Lombardi F; O'Gara PT; Page RL; Tavazzi L; et al. (JAMA: Journal of the American Medical Association, 2012)