Bradley Beverly J, Gresham Louise S, Sidelinger Dean E, Hartstein Bonnie H
University of California, San Diego, Division of Community Pediatrics, 9500 Gilman Drive, Dept. 0927, La Jolla, California 92093-0927, USA.
Pediatr Ann. 2003 Feb;32(2):86-94. doi: 10.3928/0090-4481-20030201-06.