[1] Vet Affairs VA Med Ctr, Ctr Dermatoepidemiol, Providence, RI USA
[2] Brown Univ, Dept Dermatol, Warren Alpert Med Sch, Providence, RI 02912 USA
[3] Massachusetts Vet Epidemiol & Res Informat Ctr MA, Boston Cooperat Studies Program Coordinating Ctr, Boston, MA USA
[4] Bay Pines VA Healthcare Syst, Bay Pines, FL USA
[5] Edward Hines Jr VA Hosp, Hines, IL USA
[6] VA Palo Alto Hlth Care Syst, Palo Alto, CA USA
[7] Atlanta VA Med Ctr, Atlanta, GA USA
[8] VA Loma Linda Healthcare Syst, Loma Linda, CA USA
[9] Minneapolis VA Hlth Care Syst, Minneapolis, MN USA
[10] VA Tennessee Valley Healthcare Syst, Nashville, TN USA
[11] Denver VA Med Ctr, Denver, CO USA
[12] Durham VA Med Ctr, Durham, NC USA
[13] Boston VA Hlth Care Syst, Boston, MA USA
[14] Philadelphia VA Med Ctr, Philadelphia, PA USA
[15] Miami VA Healthcare Syst, Miami, FL USA
[16] VA Clin Res Pharm Coordinating Ctr, Albuquerque, NM USA
[17] NCI, Ctr Canc Res, Bethesda, MD 20892 USA
[18] Cooperat Studies Program Cent Off, Washington, DC USA