1. Epidemiology of psoriasis: clinical issues;Krueger;J Invest Dermatol,1994
2. Incidence of psoriasis in Rochester, Minn., 1980–1983;Bell;Arch Dermatol,1991
3. The treatment of severe psoriasis: a national survey;Peckham;Arch Dermatol,1987
4. National Ambulatory Medical Care Survey: 1989 summary;Schappert;Vital Health Stat,1992
5. National Ambulatory Medical Care Survey: 1990 summary;Schappert;Adv Data,1992