内視鏡検査について Part.3

>>356
A total of 1015 serum samples were obtained from the National Institute of Infectious Diseases in Tokyo.
All of these samples were from healthy persons aged 0-89 yr (442 male and 573 female; median age 35.6 yr), living in seven prefectures in the central part of Japan in 1974, 1984, and 1994.
こっちの方が生検より偏りにくいだろうね。