Epirubicin And Cyclophosphamide (Ec) Followed By Paclitaxel (T) Versus Fluorouracil, Epirubicin And Cyclophosphamide (Fec) Followed By T, All Given Every 3 Weeks Or 2 Weeks, In Node-Positive Early Breast Cancer (Bc) Patients (Pts). Final Results Of The Gruppo Italiano Mammella (Gim)-2 Randomized Phase Iii Study