Health related quality of life and comorbidity: a descriptive analysis comparing EQ-5D dimensions of patients in the German disease management program for type 2 diabetes and patients in routine care - Ose, Dominik; Miksch, Antje; Urban, Elisabeth; Natanzon, Iris; Szecsenyi, Joachim; Kunz, Cornelia Ursula; Freund, Tobias (BMC health services research, 2011)