Haematocrit influences insulin concentration measurements in dried blood spots. - Salis ER; Reith DM; Broadbent RS; Medlicott NJ (The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians, 2016)