[1
]
Clinic of Rheumatology, Luzerner Kantonsspital, 6000 Lucerne 16, Switzerland. Electronic
address: ralph.melzer@luks.ch.
[2
]
Institute of Pathology, Luzerner Kantonsspital, Lucerne, Switzerland.
[3
]
Institute of Radiology, Luzerner Kantonsspital, Lucerne, Switzerland.
[4
]
Imaging & Therapy Division, Healthcare Sector, Siemens AG, Forchheim, Germany.