Is ultrasound training sustainable? A systematic review of competency retention in healthcare trainees. - Wang, Liang‐Wei; Liu, Cheng‐Heng; Li, Wen‐Yi; Chiang, Wen‐Chu; Chiu, Yen‐Lin; Ma, Matthew Huei‐Ming; Chen, Huey‐Ling; Yang, Chih‐Wei (Medical Education, 2025)