Idiopathic Pulmonary Fibrosis Registry China study (PORTRAY): protocol for a prospective, multicentre registry study by Ling Zhao, Min Liu, Huaping Dai, Chen Wang, Bingbing Xie, Yanhong Ren, Jing Geng, Xuan He, Chengjun Ban, Shiyao Wang, Dingyuan Jiang, Sa Luo, Qihang Chen, Ruie Feng

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