At least two weeks of staying the Dutch singer Koos Alberts in the hospital. The 71-year-old artist was in the Antoni van Leeuwenhoekziekenhuis in Amsterdam operated on for malignant tumors in his bladder. Doctors removed the bladder, and an additional chemo is necessary. The further treatment depends on the stage of the disease. Alberts lose the courage to do, and says that he want to continue to occur.