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ncbi.nlm.nih.gov
Yan và đồng nghiệp 2016, tr. 2. Yan, Liang; Salim, Abdulbaset M.; Wu, Wendy; Kilgore, Paul E. (2016). "Chao Yuanfang: Imperial Physician of the Sui Dynasty and an Early Pertussis Observer?". Open Forum Infectious Diseases. Quyển 3 số 1. tr. ofw017. doi:10.1093/ofid/ofw017. PMC4786867. PMID26977422.
pubmed.ncbi.nlm.nih.gov
Yan và đồng nghiệp 2016, tr. 2. Yan, Liang; Salim, Abdulbaset M.; Wu, Wendy; Kilgore, Paul E. (2016). "Chao Yuanfang: Imperial Physician of the Sui Dynasty and an Early Pertussis Observer?". Open Forum Infectious Diseases. Quyển 3 số 1. tr. ofw017. doi:10.1093/ofid/ofw017. PMC4786867. PMID26977422.