In order to evaluate a possible association between age of first parturition and the number of births and pancreatic cancer, we conducted a case control study with a hospital background.
为了评价首胎年龄和生育数与胰腺癌的发生可能存在的关系，作者做了以医院为基础的病例对照研究。
In order to evaluate a possible association between age of first parturition and the number of births and pancreatic cancer, we conducted a case control study with a hospital background.
为了评价首胎年龄和生育数与胰腺癌的发生可能存在的关系，作者做了以医院为基础的病例对照研究。
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