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日本厚生省的“特发性造血障碍调查研究班”于1979年1月开始,用通信调查的方法,二次共收集了648个病例。其病例组成如表1所示。
Japan’s Ministry of Health, “Idiopathic Hematopoietic Diseases Research Class” began in January 1979, using the method of communication survey, a total of 648 cases were collected. The case composition as shown in Table 1.