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https://www.reuters.com/article/us-major-surgery-ice-pain-idUSKBN0EM1UY20140611 

Kullenberg, Björn; Ylipää, Staffan; Söderlund, Kerstin; Resch, Sylvia (2006-12-01). "Postoperative Cryotherapy After Total Knee Arthroplasty: A Prospective Study of 86 Patients". The Journal of Arthroplasty. 21 (8): 1175–1179. doi:10.1016/j.arth.2006.02.159. ISSN 0883-5403. PMID 17162178.