Effect of music on preoperative anxiety using the Hamilton State-Trait Anxiety Inventory (STAI) in patients undergoing cataract surgery in the University of Nigeria Teaching Hospital, Ituku Ozalla. - Ezepue CO; Anyatonwu OP; Duru CC; Odini F; Onoh C; Nwachukwu N; Oguonu CA (BMJ open ophthalmology, 2023)