Galil Karin, Pletcher Mark J, Wallace Barbara J, Seward Jane, Meyer Pamela A, Baughman Andrew L, Wharton Melinda
Centers for Disease Control and Prevention, Atlanta, GA 30333, USA.
Am J Public Health. 2002 Aug;92(8):1248-50. doi: 10.2105/ajph.92.8.1248.