Pediatrics.
2010

BMC Pediatrics.
2009

Journal of Clinical Epidemiology.
2008

American Journal of Public Health.
2008

American Journal of Preventive Medicine.
2006

American Journal of Preventive Medicine.
2006

American Journal of Preventive Medicine.
2006

American Journal of Preventive Medicine.
2006

American Journal of Preventive Medicine.
2006

Pediatrics.
2006

Pediatrics.
2006

Journal of midwifery & women's health.
2005

Emerging Infectious Diseases.
2005

Medical Care.
2003

Medical Care.
2003

Effective Clinical Practice.
2002