BirthStats: percentage of preterm births, United States and selected European countries, 2004.
MacDorman
Marian F
MF
Division of Vital Statistics, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland, USA.
Mathews
T J
TJ
D005060:Europe / Q000453:epidemiology; D006801:Humans; D047928:Premature Birth / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology