[1] Univ Texas Southwestern Med Sch, Univ Texas Southwestern Med Ctr, Dallas, TX USA
[2] Univ Texas Southwestern Med Ctr, Dept Dermatol, Dallas, TX USA
[3] Univ Texas Southwestern Med Ctr, Peter ODonnell Jr Sch Publ Hlth, Dept Biostat, Dallas, TX USA
[4] Univ Texas Southwestern Med Ctr, Dept Obstetricsand Gynecol, Dallas, TX USA