RT Journal
A1 Levenstein P, Levenstein S
T1 LOng-term effects of home visits on children's behavior
JF JAMA
JO JAMA
YR 1999
FD April 21
VO 281
IS 15
SP 1375
OP 1377
DO 10-1001/pubs.JAMA-ISSN-0098-7484-281-15-jbk0421
UL http://dx.doi.org/10-1001/pubs.JAMA-ISSN-0098-7484-281-15-jbk0421
AB 
It remains to be shown how such a minimal intervention (bimonthly to
monthly home visits by a nurse, often limited to the period of
pregnancy) could effect such profound and long-lasting changes; the
authors themselves propose few candidate mechanisms beyond biological
mediators such as decrease in fetal tobacco exposure.