- Correspondence to Dr Martine Vrijheid, CREAL- Centre for Research in Environmental Epidemiology, Barcelona Biomedical Research Park (PRBB), Doctor Aiguader, 88; Barcelona 08003, Spain;
- Received April 10, 2014
- Revised May 14, 2014
- Accepted May 16, 2014
- First published June 6, 2014.
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