2Speroff L, Mishell-DR Jr. The postpartum visit: it's time for a change in order to optimally initiate contraception[J]. Contracep- tion,2008,78(2):90-98.
3Christie J, Bunting B. The effect of health visitors' postpartum home visit frequency on first-time mothers." duster randomised tri- al[J]. International journal of nursing studies,2011,48(6):689-702.