Open Procedure On Electronic Platform Pursuant To Art. 71 Of The D. Lgs. 36/2023, With Award Criterion Pursuant To Art. 108, Paragraphs 1 And 2, Of Legislative Decree 36/2023, For The Assignment In A Single Lot Of The Home Parenteral Nutrition Service For The Clients Relating To The Asp Of Messina For A Period Of Four Years.