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Imhoff reports personal fees outside the submitted work from Arthrex, Naples, FL, USA, personal fees from Medi, Bayreuth, GER, personal fees from Arthrosurface, Franklin, MA, USA. P.U. Brucker reports personal fees outside the submitted work from Arthrex, Naples, FL, USA, personal fees from Medi, Bayreuth, GER, personal fees from Bauerfeind, Zeulenroda-Triebes, GER. P.U. Brucker receives research grants from Gesellschaft f\u00fcr Arthroskopie und Gelenkchirurgie (AGA), Bundesinstitut f\u00fcr Sportwissenschaft (BISp) and Alwin-J\u00e4ger-Stiftung outside the submitted work. The remaining authors declare no conflict of interest.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"This study has been approved by the institutional review board of the Technical University of Munich, Germany (IRB No. 237\/15).","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}]}}