Validity, reliability, and feasibility of durometer measurements of scleroderma skin disease in a multicenter treatment trial

Peter A. Merkel, Nancy P. Silliman, Christopher P. Denton, Daniel E. Furst, Dinesh Khanna, Paul Emery, Vivien M. Hsu, James B. Streisand, Richard P. Polisson, Anita Åkesson, John Coppock, Frank Van Den Hoogen, Ariane Herrick, Maureen D. Mayes, Douglas Veale, James R. Seibold, Carol M. Black, Joseph H. Korn