Lyu, Jihui, Li, Wenjie, Rong, Xiangjiang, Wei, Lian, Huang, Nayan, Champ, Mei, Xiong, Qian, Chen, Xueli, Li, Mo, Li, Fangling, "Efficacy of practising Tai Chi for older people with mild dementia: Protocol for a randomised controlled study", BMJ Open, 2018