Affiliation: | 1. Department of Orthodontics, University of Geneva, Geneva, Switzerland Correspondence to: Jean-Paul Schatz, Department of Orthodontics, School of Dentistry, 19, rue Barthélémy-Menn, CH-1211 Geneva 4, Switzerland Tel.: +41 2. 22 3. 379 4. 40 5. 21 Fax: +41 6. 22 e-mail: jpschatz@bluemail.ch;7. Department of Behavioural and Community Dentistry, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;8. Department of Orthodontics, University of Geneva, Geneva, Switzerland |