Reliability and validity of the short questionnaire to assess health-enhancing physical activity (SQUASH) in patients after total hip arthroplasty by Wendel-Vos GC Wanda, Kootstra Johan WJ, Bulstra Sjoerd K, Zijlstra Wiebren, Groothoff Johan W, Akker-Scheek Inge, Wagenmakers Robert, van Raaij Jos JAM, Stevens Martin

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