| Institute of Medicine 1990 , , Washington : National Academies Press, Page 138, Part 1 | |
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| Jeffrey Bytomski 27-11-2017 , , Sports Health, Issue 1, Folder 10, Page 47-53 | Jose Galgani, Mauricio Sepulveda, Cristian Luco and others 8-2018 , , Clinical science, Issue 16, Folder 132, Page 1751—1741 |