A multicentre postal survey investigating the contribution of illness perceptions, coping and optimism to quality of life and mood in adults with muscle disease. by Graham, C, Weinman, J, Sadjadi, R, Chalder, T, Petty, R, Hanna, MG, Turner, C, Parton, M, Maddison, P, Radunovic, A, Longman, C, Robb, Y, Bushby, K, Hilton-Jones, D, Rose, MR