National Thalassemia Registry: a 30 year journey of implementing carrier screening in Singapore - Stella Zhang; Guek Peng Tan; Soh Lan Peh; Swee Lim Ang; Sylvia Kam; Weng Khong Lim; Teck Wah Ting; Angeline Lai; Ee Shien Tan; Saumya Shekhar Jamuar; Hai Yang Law; Ivy Ng (The Lancet Regional Health. Western Pacific)