Open Procedure For The Assignment Of The Express Courier Service For The Withdrawal, Transport And Delivery Of Dry Blood Spots For Sne And Sma, From The Birth Points Of Western And Eastern Sicily At The Sne Laboratory Centers Of The P.O. "G. Di Cristina" Of Palermo And The P.O. "G. Rodolico Of The A.O.U. Policlinico G. Rodolico - San Marco" Of Catania