- Correspondence to Dr Lidia Mínguez-Alarcón, Department of Environmental Health, Harvard T.H. Chan School of Public Health, 665 Huntington Ave, Boston, MA 02115, USA;
- Received 14 July 2016
- Revised 29 November 2016
- Accepted 5 December 2016
- Published online 6 February 2017.
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