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Paper published by Dr Hai-feng Ma:
Original Research
A comparative study of the five-repetition sit-to-stand test and the 30-second sit-to-stand test to assess exercise tolerance in COPD patients
Zhang Q, Li YX, Li XL, Yin Y, Li RL, Qiao X, Li W, Ma HF, Ma WH, Han YF, Zeng GQ, Wang QY, Kang J, Hou G
International Journal of Chronic Obstructive Pulmonary Disease 2018, 13:2833-2839
Published Date: 10 September 2018