[1] CDC, EIS, Atlanta, GA 30333 USA
[2] Childrens Natl Med Ctr, Dept Dermatol, Washington, DC 20010 USA
[3] Childrens Natl Med Ctr, Dept Neonatol, Washington, DC 20010 USA
[4] CDC, Sci Educ & Profess Dev Off, Off Publ Hlth Sci Svcs, Atlanta, GA 30333 USA
[5] Texas Childrens Hosp, Houston, TX 77030 USA