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Leung GM, Lam TH, Wong I, Thach TQ.Leung GM, et al. Among authors: lam th.BMJ. 2002 Feb 23;324(7335):486. doi: 10.1136/bmj.324.7335.s63a.BMJ. 2002.PMID: 11863009No abstract available.
Lam TH, He Y, Shi QL, Huang JY, Zhang F, Wan ZH, Sun CS, Li LS.Lam TH, et al.Ann Epidemiol. 2002 Jul;12(5):316-20. doi: 10.1016/s1047-2797(01)00258-7.Ann Epidemiol. 2002.PMID: 12062918