From the *University of Alberta, Edmonton, Alberta, Canada, †Finnish Twin Cohort Study, Department of Public Health, University of Helsinki, Helsinki, Finland, ‡University of Washington, Seattle, Washington, §Kuopio University Hospital and Kuopio University, Kuopio, Finland, and the ∥Department of Mental Health, National Public Health Institute, Helsinki, Finland.
Supported by National Institutes of Health (U.S. grant no. AR 40857), the Ministry of Education, the Finnish Work Environment Fund, the Academy of Finland (grant no. 42044), and the Alberta Heritage Foundation for Medical Research, Canada.
Acknowledgment date: June 5, 2002.
First revision date: August 21, 2002.
Acceptance date: August 22, 2002.
The legal regulatory status of the device(s)/drug(s) that is/are the subject of this manuscript is not applicable in my country.
Federal and foundation funds were received in support of this work. No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript.
Address correspondence to Tapio Videman, MD, PhD, University of Alberta, Faculty of Rehabilitation Medicine, 3-48 Corbett Hall, Edmonton, Alberta T6G 2G4, Canada; E-mail: [email protected]