Wahl Hans-Werner, Deeg Dorly J H
Institute of Psychology, University of Heidelberg, 69115 Heidelberg, Germany.
VU University Medical Centre/LASA, 1081 BT Amsterdam, The Netherlands.
Eur J Ageing. 2007 Feb 13;4(1):1-2. doi: 10.1007/s10433-007-0043-7. eCollection 2007 Mar.