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