Pollard WE, Bobbitt RA, Bergner M, Martin DP, Gilson BS. The Sickness Impact Profile: reliability of a health status measure. Med Care. 1976 Feb;14(2):146-55.
Pollard WE, Bobbitt RA, Bergner M, Martin DP, Gilson BS. The Sickness Impact Profile: reliability of a health status measure. Med Care. 1976 Feb;14(2):146-55.