Villar R G, Connick M, Barton L L, Meaney F J, Davis M F
Department of Pediatrics and the Steele Memorial Children's Research Center, University of Arizona, Tucson 85724-5073, USA.
Arch Pediatr Adolesc Med. 1998 Oct;152(10):1035-7. doi: 10.1001/archpedi.152.10.1035.