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n=799,881
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1.
With
incidence
density
sampling
,
control
participants
(
n
=
799
,
881
)
were
matched
by
practice
site
,
calendar
period
,
and
follow-up
duration
.
根据
发病
密度
抽样
，
对照
组
（
n=799,881
）
在
发病
地点
、
时间
及
随访
期限
上
与
病例
组
相
匹配
。
gēn jù
fā bìng
mì dù
chōu yàng
,
duì zhào
zǔ
(
n= qī jiǔ jiǔ , bā bǎi bā shí yī
)
zài
fā bìng
dì diǎn
、
shí jiān
jí
suí fǎng
qī xiàn
shàng
yǔ
bìng lì
zǔ
xiāng
pǐ pèi
。
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