Paris (Le Supplément, 1992), Roma (CNR, 1992), Paris (UNESCO, 1992), Perugia (Università, 1993), Tunis (Faculté de Droit et des Sciences Politiques, 1996), Strasbourg (Council of Europe, 1996), Freiburg i. B. (German Academy for Ethics in Medicine, 1997), Marseille (Association européenne des centres d'éthique médicale, 1999), Hannover (Zentrum fur Gesundheitsethik et Evangelische Akademie of Loccum, 1999), Singapore (Asia Europe Foundation, 2004), Pontignano, Siena (British Council, 2004), Roma (Università Roma 3 and European Science Foundation, 2004).