1. SIVA, Fondazione Don Carlo Gnocchi ONLUS, via Capecelatro 66, I-20148 Milano, Italy. E-mail: serenella.besio@siva.it
2. STAKES, National Research and Development Centre for Welfare and Health, PL 220, 00531 Helsinki, Finland. Tel.: ; E-mail: Anna-Liisa.Salminen@stakes.fi