[1] Mahidol Univ, Med Siriraj Hosp, Dept Pharmacol, Fac Med, Bangkok, Thailand
[2] Univ Alabama Birmingham, Dept Dermatol, Birmingham, AL 35294 USA
[3] Univ Alabama Birmingham, Ctr Comprehens Canc, Canc Chemoprevent Program, Birmingham, AL 35294 USA
[4] VA Med Ctr, Birmingham, AL 35233 USA