Figure 1.

Trends of preterm birth (PTB) at less than 37 weeks, medically indicated PTB, spontaneous PTB, low birth weight (LBW), and term-LBW from 1997 to 2010.

Yorifuji et al. BMC Pregnancy and Childbirth 2012 12:162   doi:10.1186/1471-2393-12-162
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