Effect of fenofibrate on the need for laser treatment for diabetic retinopathy (FIELD study): a randomised controlled trial. - Keech AC; Mitchell P; Summanen PA; O'Day J; Davis TM; Moffitt MS; Taskinen MR; Simes RJ; Tse D; Williamson E; Merrifield A; Laatikainen LT; et al. (Lancet, 2007)