1. Department of Electrical Measurements, Lund University, Box 118, 221 00 Lund, Sweden, Department of Laboratory Medicine, Division of Clinical Chemistry, Lund University, Malmo University Hospital, 205 02 Malmo, Sweden, Blood Center Skane, Lund University Hospital, 221 85 Lund, Sweden, and Departments of Clinical Laboratories, Surgery (Urology), and Medicine (GU-Oncology), Memorial Sloan-Kettering Cancer Center, New York, New York 10021