1. Collagen vascular diseases;Callen;J Am Acad Dermatol,2004
2. Topical photodynamic therapy for localized scleroderma;Karrer;Acta Derm Venereol,2000
3. Inter and intraobserver variability of total skin thickness score (modified Rodnan TSS) in systemic sclerosis;Clements;J Rheumatol,1995
4. Topical photodynamic therapy for non-cancerous skin conditions;Mitra;Photodiagn Photodyn Ther,2006
5. Use of a durometer to assess skin hardness;Falanga;J Am Acad Dermatol,1993