Additional file 3: of Prevention of vitamin D deficiency in children following cardiac surgery: study protocol for a randomized controlled trial McNallyJ. O’HearnKatie LawsonMargaret MaharajhGyaandeo GeierPavel WeilerHope RedpathStephanie McIntyreLauralyn FergussonDean MenonKusum 2015 Flow chart of study-related safety measures. (JPEG 166 kb)