1. Department of Human Pathology, School of Medicine, Tokyo Medical and Dental University
2. First Department of Internal Medicine, School of Medicine, Kumamoto University, Kumamoto
3. Department of Pathology, Japanese Red Cross Medical Center
4. Fourth Department of Internal Medicine, Nippon Medical School
5. Department of Pneumology and Allergology, Ruhrlandklinik, Essen
6. Department of General and Experimental Pathology, Bochum University, Bochum, Germany
7. Sarcoidosis Clinic
8. Institute of Pathology, Niguarda Hospital, Milan, Italy
9. Interstitial Lung Disease Unit
10. Department of Histopathology, Royal Brompton Hospital, London, England
11. Department of Medicine, School of Medicine, University of Southern California, Los Angeles, California 90033