Tang and colleagues conducted a hospital-based case-control study that examined 948 patients diagnosed with primary lung cancer between 1982 and 1998, and 1743 healthy controls.
Tang和他的同事进行了一项医院为基础的病例对照研究，调查了1982年至1998年期间的948例原发性肺癌，1743例健康对照。
DESIGN: Randomized case control study to patients based on diagnosis SETTING: department of general diseases, rehabilitation room and ultrasound department of a university hospital.
设计：以患者为研究对象，以诊断为依据的随机对照研究。单位：一所大学医院的综合科、康复室及超声波室联合进行的课题研究。
DESIGN: Randomized case control study to patients based on diagnosis SETTING: department of general diseases, rehabilitation room and ultrasound department of a university hospital.
设计：以患者为研究对象，以诊断为依据的随机对照研究。单位：一所大学医院的综合科、康复室及超声波室联合进行的课题研究。
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