Alterations in nailfold videocapillaroscopy among patients with connective tissue diseases combined with pulmonary arterial hypertension: A cross-sectional study by Zhicheng Tang, Fan Yang, Haolin Wu, Ying Zhao, Jingyi Shen, Huiming Hong, Fanzhang Yin, Xiaolei Ma, Linyu Geng, Xue Xu, Yu Wei, Huayong Zhang

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