Negotiated Procedure To Be Initiated Pursuant To Art. 50 Legislative Decree No. 36/2023 And Subsequent Amendments, For The Purchase Of 10 Elisa Kits-Project "The Role Of Irisin In The Treatment Of Knee Osteoarthritis; Multicentre, Randomized, Prospective, Single-Blind Study On The Evaluation Of The Effect Of Whole-Body Electro-Myo-Stimulation In Addition To Aerobic Physical Activity" (Code Irisoa-Wb-Ems, Pnrr -Mad-2022-12376898) Master Cup F83C22002480001 -Derivative Cup B93C22002000001-Accounting Key Pnrr-B93C22002000001-01 To Be Carried Out At The U.O.C. Orthopedics And Traumatology.