Charing Cross Hospital, London, England

Chelsea and Westminster Hospital, London, England

Hammersmith Hospital, London, England

The Hull Royal Infirmary, Yorkshire, England

The London Chest Hospital, London, England

The Royal Free Hospital, London, England

St. Marks Hospital, London, England

University College Hospital, London, England

Clínica Universitaria de Navarra, University of Navarra, Pamplona, Spain

University of Rome - La Sapienza, Rome, Italy

Cornell University, New York, USA

Mallinckrodt Institute of Radiology, St. Louis, USA

University of Arizona, Tucson, USA

University of Wisconsin Medical School, Madison, WI, USA

Veterans Affairs Medical Center, San Francisco, USA

Walter Reed Army Medical Center, Washington DC, USA

Toronto General Hospital, Toronto, Canada

The National Cancer Center, Tokyo, Japan

Seoul National University Hospital, Seoul, Korea

The Beijing Cancer Institute, Beijing, PR China

The Beijing Hospital, Beijing, PR China

The Beijing Friendship Hospital, Beijing, PR China