Can Peak Respiratory Exchange Ratio Be Used as a Predictor for Stopping Symptom-limited Maximal Cardiopulmonary Exercise Testing?　
CI Zheng，SUN Xingguo，DAI Yaqi，ZHANG Ye，GE Wangang，LI Hao，ZHU Jiabao，LIU Qin，HAO Lu，STRINGER W W
Chinese General Practice . 2018, (30): 3680 -3686 .  DOI: 10.12114/j.issn.1007-9572.2018.00.252

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