AU - Rentz AC, Samore MH, Stoddard GJ, Faix RG, Byington CL TI - RIsk factors associated with ampicillin-resistant infection in newborns in the era of group b streptococcal prophylaxis PT - JOUR DP - 2004 TA - Archives of Pediatrics & Adolescent Medicine pages = {556-560}, VI - 158 IP - 6 AID - 10.1001/archpedi.158.6.556 [doi] 4100 - http://dx.doi.org/10.1001/archpedi.158.6.556 SO - Archives of Pediatrics & Adolescent Medicine June 1, 2004 158(6):556