- Correspondence to Dr Eva Morales, Centre for Research in Environmental Epidemiology (CREAL), Parc de Recerca Biomèdica de Barcelona, Dr. Aiguader 88, Barcelona, Catalonia 08003, Spain;
- Received March 12, 2014
- Revised August 7, 2014
- Accepted August 15, 2014
- First published October 20, 2014.
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