1. University School of Health and Sport, University of Girona, Salt, Spain
2. Keck Laboratory for Network Physiology, Department of Physics, Boston University, Boston, Massachusetts
3. Complex Systems in Sport, INEFC Universitat de Barcelona, Barcelona, Spain
4. Evolutionary Systems Group Laboratory, Department of Physics, University of Calabria, Arcavacata di Rende, Italy
5. University of Balearic Islands, Department of Psychology, Research Institute of Health Sciences and Health Research Institute of the Balearic Islands, Palma, Spain
6. Harvard Medical School and Division of Sleep Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
7. Institute of Solid State Physics, Bulgarian Academy of Sciences, Sofia, Bulgaria