Medical informatics education needs information system practicums in health care settings - experiences and lessons learned from 32 practicums at four universities in two countries - Haux, R; Ammenwerth, E; Häber, A; Hübner-Bloder, G; Knaup-Gregori, P; Lechleitner, G; Leiner, F; Weber, R; Winter, A; Wolff, AC (Methods Inf Med, 2006)