A validation study of the WHO analgesic ladder: a two-step vs three-step strategy by Maltoni, Marco, Scarpi, Emanuela, Modonesi, Caterina, Passardi, Alessandro, Calpona, Sebastiano, Turriziani, Adriana, Speranza, Raffaella, Tassinari, Davide, Magnani, Pierantonio, Saccani, Denis, Montanari, Luigi, Roudnas, Britt, Amadori, Dino, Fabbri, Laura, Nanni, Oriana, Raulli, Paola, Poggi, Barbara, Fochessati, Francesca, Giannunzio, Donatella, Barbagallo, Maria Lucia, Minnotti, Vincenzo, Betti, Maura, Giordani, Stefano, Piazza, Elena, Scapaticci, Roberto, Ferrario, Sabrina

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