1 Unit of Biostatistics, Department of Statistics and Operations Research, School of Medicine, University of Santiago de Compostela (USC), Santiago de Compostela, Spain.
2 Medical-Surgical Dentistry Research Group (OMEQUI), Health Research Institute of Santiago de Compostela (IDIS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain.
3 Rede Galega INBIOEST, Santiago de Compostela, Spain.
4 Medical-Surgical Dentistry Research Group (OMEQUI), Health Research Institute of Santiago de Compostela (IDIS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain. marcio.diniz@usc.es.