1. Department of Nuclear Medicine, Royal Liverpool University Hospital, Liverpool,
2. Institute of Nuclear Medicine, University College London, London, UK,
3. Azienda Ospedaliera S.Orsola-Malpighi, Bologna, Italy,
4. Department of Nuclear Medicine, General Hospital, Kuala Lumpur, Malaysia and
5. Nuclear Medicine and Diagnostic Imaging Section, Division of Human Health; IAEA, Vienna, Austria