Sege Robert D, Flanigan Elizabeth, Levin-Goodman Rebecca, Licenziato Vincent G, De Vos Edward, Spivak Howard
Pediatric and Adolescent Health Research Center, the Floating Hospital for Children at Tufts-New England Medical Center, Boston, Massachusetts 02111, USA.
Am J Prev Med. 2005 Dec;29(5 Suppl 2):215-9. doi: 10.1016/j.amepre.2005.08.026.