- Correspondence to Dr Jose M. Martínez Sánchez, Biostatistics Unit, Department of Basic Sciences, Universitat Internacional de Catalunya, Carrer de Josep Trueta s/n, Sant Cugat del Vallès 08195, Barcelona;
- Received 11 April 2016
- Revised 1 August 2016
- Accepted 24 August 2016
- Published online 13 September 2016.
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