- Correspondence to Mrs Dolores Romano, Instituto Sindical de Trabajo, Ambiente y Salud (ISTAS), c/ General Cabrera 21, E-28020 Madrid, Spain;
- Accepted 2 March 2010
- Published in print 1 January 2011.
- Published online 2 December 2010.
- Published first 27 May 2010.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.