, King's College, London (Royaume-Uni)
, Clinique de Chirurgie Orale, Faculté de Stomatologie, Belgrade, Yougoslavie (Portugal)

, Université Libre de Bruxelles (Belgique)
, Université de Lille II (France)
, Instituto Superior de Ciências da Saúde –Norte (ISCS-N), Gandra (Portugal)
, Shimane University Hospital (Japon)
, Niigata University Graduate School of Medical and Dental Sciences
, Nippon Medical School
(France)
, Shimane University Hospital (Japon)
, Osaka University

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