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西德《慕尼黑医学周刊》第122卷第47期第1666页(1980年)报道:1975年3月至1978年12月,伦敦医学研究所对16,000名男子进行了一次体检。研究人员先了解受检者的病历、吸烟习惯,然后再进行肺功能测试、心电图、胸部X线透视和一系列血液检查。由于国立保健系统和人口调查部门的协助,他们又重新评价了所有肿瘤疾患和死者的情况。到1979年底,16,000名受检者中,共发现86名恶性肿瘤患者,其中绝大多数是患肺癌、消化道癌和皮肤癌。为此他们仿照患者的年龄和吸烟习惯选择了172名对照者,以便测量和比较其维生素A_1的浓度。
West German “Munich Medical Week” Volume 122 No. 47 Page 1666 (1980) reported: March 1975 to December 1978, the London Institute of Medicine on 16,000 men conducted a physical examination. Researchers first understand the subject’s medical records, smoking habits, and then carry out pulmonary function tests, electrocardiogram, chest X-ray and a series of blood tests. With the assistance of the National Health Systems and Census Department, they re-evaluated all cancer conditions and the dead. By the end of 1979, of the 16,000 subjects, a total of 86 malignant tumors were found, the vast majority of them suffering from lung cancer, gastrointestinal cancer and skin cancer. To this end they modeled on the patient’s age and smoking habit 172 controls were selected in order to measure and compare their vitamin A 1 concentrations.