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Heckman JD, Lee PP, Jackson CA, Relles D, Weinstein JN, Gebhardt MC, Simon MA, Callaghan JJ, D’Ambrosia RD, Hamilton JJ, Spengler DM, Waddell JP, Greer RB, Graham AW, Fun J, Ranawat CS, Luck JV. Orthopaedic workforce in the next millennium. Journal of Bone and Joint Surgery. 1998. p. 1534–1551.