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Vital Health Stat 10. 2004 Mar; (221):1-78.
[Vital Health Stat 10. 2004]
Vital Health Stat 10. 2009 Jan; (239):1-80.
[Vital Health Stat 10. 2009]
Vital Health Stat 10. 2006 Dec; (231):1-84.
[Vital Health Stat 10. 2006]
Health Serv Res. 1989 Feb; 23(6):807-48.
[Health Serv Res. 1989]
Pediatrics. 1993 May; 91(5 Pt 2):1031-9.
[Pediatrics. 1993]
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