进行了家系调查，其中二例为近亲结婚，一例为非近亲结婚，结合文献对病因和诊断方法进行了讨论。
An investigation was made on family history. Their parents of two out of these patients married close relatives. Etiology and diagnostic methods are discussed.
进行了家系调查，其中二例为近亲结婚，一例为非近亲结婚，结合文献对病因和诊断方法进行了讨论。
An investigation was made on family history. Their parents of two out of these patients married close relatives. Etiology and diagnostic methods are discussed.
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