%0 Journal Article %A Leland J. Davis %T Developmental-Behavioral Pediatrics. Third edition %D 1999 %R 10.3122/jabfm.12.6.508b %J The Journal of the American Board of Family Practice %P 508-509 %V 12 %N 6 %U https://www.jabfm.org/content/jabfp/12/6/508.2.full.pdf