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A funding organization was incorrectly omitted from the Funding Statement. The first sentence of the Funding Statement should read: "The study was financially supported by the Deutsche Vereinigung für Schulter- und Ellenbogenchirurgie (DVSE, a non-profit organization, http://www.dvse.info/) and the European Society for Surgery of the Shoulder and the Elbow (SECEC/ESSSE, a non-profit organization, http://www.secec.org/)."
Competing Interests: No competing interests declared.
