Prospective identification of variables as outcomes for treatment (PIVOT): study protocol for a randomised, placebo-controlled trial of hydroxyurea for Ghanaian children and adults with haemoglobin SC disease. - Smart, Luke R.; Segbefia, Catherine I.; Latham, Teresa S.; Stuber, Susan E.; Amissah-Arthur, Kwesi N.; Dzefi-Tettey, Klenam; Lane, Adam C.; Dei-Adomakoh, Yvonne A.; Ware, Russell E. (Trials, 2023)