Efficacy of platelet-rich plasma for chronic tennis elbow: a double-blind, prospective, multicenter, randomized controlled trial of 230 patients - Mishra, A K; Skrepnik, N V; Edwards, S G; Jones, G L; Sampson, S; Vermillion, D A; Ramsey, M L; Karli, D C; Rettig, A C (Am J Sports Med, 2014)