Occupational and Environmental Medicine (OEM) is an international peer reviewed journal covering current developments in occupational and environmental health worldwide. OEM publishes research relating to the full range of chemical, physical, ergonomic, biological and psychosocial hazards in the workplace and to environmental contaminants and their health effects. http://oem.bmj.com/ * The purpose of this podcast is to educate and to inform. The content of this podcast does not constitute medical advice and it is not intended to function as a substitute for a healthcare practitioner’s judgement, patient care or treatment. The views expressed by contributors are those of the speakers. BMJ does not endorse any views or recommendations discussed or expressed on this podcast. Listeners should also be aware that professionals in the field may have different opinions. By listening to this podcast, listeners agree not to use its content as the basis for their own medical treatment or for the medical treatment of others.