Bmj杂志给的返修，大家帮我看一下
iRobot 管理员提问于 1年 前
The study is designed as a retrospective cohort study which carries many important limitations including recall bias, coding errors, and missing data.
所以以上问题该如何回答
iRobot 管理员提问于 1年 前
iRobot 管理员提问于 1年 前
iRobot 管理员提问于 1年 前
The study is designed as a retrospective cohort study which carries many important limitations including recall bias, coding errors, and missing data.
所以以上问题该如何回答