| Amgen Inc. , Thousand Oaks, USA |
Gedeon Richter , Budapest, Hungary |
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| TNO, Quality of Life , Zeist, The Netherlands |
University of Maryland , College Park, MD, USA |
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| University of Toronto , Toronto, Canada |
University of Tromsoe , Tromsoe, Norway |
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| University of Utrecht , Dep. of Laboratory Animals Science, The Netherlands |
John Hopkins University , Baltimore, MD, USA |
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| TUFTS University , Boston, MA, USA |
Orion Pharma , Turku, Finland |
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| University of Pittsburgh, Pittsburgh, PA, USA |
GlaxoSmithKline, Harlow, United Kingdom |
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| TNO, Quality of Life , Rijswijk (Z.H.), The Netherlands |
Chang-Gung Memorial Hospital , Kaohsiung, Taiwan, R.O.C. |
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| University of Iowa , Iowa City, Iowa, USA |
The Russian Academy of Medical Sciences , Moscow, Russia |
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| Hokkaido University , Sapporo, Japan |
Université de Sherbrooke , Québec, Canada |
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| Abbott Laboratories , Ludwigshafen, Germany |
University of California, San Fransisco, CA, USA |
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| Gazi University , Ankara, Turkey |
Wyeth , College Ville, PA, USA |
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| Chakra Biotech , Singapore |
Cornell University , Ithaca, NY, USA |
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| University of Calgary, Canada |
Retinoids , Moscow, Russia |
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