Epidemiology is one of the major courses for speciality of maternity and childhygiene.
流行病学是妇幼卫生专业主要课程之一。
2
Methods: Partial maternity and childhygiene indexes (1999-2002) of 4 least developing counties of this province were investigated and analyzed, Lintao, Kangle, Dingxi.
方法：对临洮、康乐、定西、和政4县1999 - 2002年部分妇幼卫生指标进行调查分析。
3
Helping your child maintain excellent oral hygiene is an important step in preventing bacterial endocarditis.