- Correspondence to Dr Jose M Martínez-Sánchez, Biostatistics Unit, Department of Basic Sciences, Universitat Internacional de Catalunya, Sant Cugat del Vallés, Barcelona, Spain;
- Received 25 May 2015
- Accepted 25 January 2016
- Published in print 1 March 2017.
- Published online 20 February 2017.
- Published first 17 February 2016.
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