Quality-of-life questionnaires developed by the European Organization for Research and Treatment for Cancer (EORTC) will be used. The EORTC QLQ-BLS24 with 24 questions specific to non-muscle-invasive bladder cancer and the EORTC QLQ-BLM30 with 30 questions specific to muscle-invasive bladder cancer will be combined and used in conjunction with the general cancer questionnaire QLQ-C30.