Prehabilitation of frail elderly PAtients undergoing majoR surgEry at HOME (PREPARE-HOME): a superiority parallel-group randomised controlled trial protocol evaluating smart wearable enhanced prehabilitation versus usual care. - Leong YH; Tay VYJ; Yang X; Tan CJ; Au-Yong PS; Sim JLX; Ng RRG; Ong MEH; Tan BPY; Abdullah HR; Ke Y (BMJ open, 2025)