Treatment of bulbar urethral strictures with Optilume drug-coated balloons in a previously untreated population (FIRST-CARE): protocol for a single-blind multicentre randomised controlled trial

在既往未接受过治疗的人群中使用 Optilume 药物涂层球囊治疗球部尿道狭窄（FIRST-CARE）：一项单盲多中心随机对照试验方案