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Xia LP, Xu GP, Zeng ZY, Rao HL, Zeng J, Hou JH.Xia LP, et al. Among authors: rao hl.Zhonghua Er Bi Yan Hou Ke Za Zhi. 2003 Apr;38(2):139-42.Zhonghua Er Bi Yan Hou Ke Za Zhi. 2003.PMID: 12889116Chinese.
Wang FL, Guo X, Yuan TZ, Cao SM, Rao HL, Hou JH, Shao Q, Li NW, Hong MH.Wang FL, et al. Among authors: rao hl.Ai Zheng. 2009 Jan;28(1):72-5. Epub 2009 Jan 15.Ai Zheng. 2009.PMID: 19448422Free article.