text_1: 排除 标准 如下 : 已知 有 重度 先天 异常 , 实际 无 生存 概率 , 或者 不太可能 接受 跟踪 随访 .
  
text_2: infants who had a known severe congenital anomaly or no realistic chance of survival or who were unlikely to be traceable for follow @-@ up were ineligible .
  