1. 18 NTD nuclear families were analysed as caseparental control study,from which Transmitted Disequillibrium Test(TDT) and Haplotypebased Haplotype Relative Risk (HHRR) were calculated;
   对18个NTD核心家庭进行以父母为对照的病例对照研究,计算TDT和HHRR；

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