- J-J Georges, Department of Public and Occupational Health, Institute for Research in Extramural Medicine, VU University Medical Center, VAN DER BOECHORSTSTRAAT 7, 1081 BT Amsterdam, The Netherlands;
- Received March 1, 2007
- Revised March 1, 2007
- Accepted March 20, 2007
- First published March 3, 2008.
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