Additional file 1: of Zinc for Infection Prevention in Sickle Cell Anemia (ZIPS): study protocol for a randomized placebo-controlled trial in Ugandan children with sickle cell anemia DattaDibyadyuti NamazziRuth ConroyAndrea CusickSarah HumeHeather TagoolaAbner WareRussell OpokaRobert JohnChandy 2019 Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) 2013 checklist: recommended items to address in a clinical trial protocol and related documents. (DOC 124 kb)