Compliance with the breakthrough cancer pain European guidelines and impact on patients' quality of life: an observational prospective study oleh Paolo Bossi, Paolo Bossi, Tatiana Pietrzyńska, Tatiana Pietrzyńska, Tatiana Pietrzyńska, César Margarit Ferri, Irene Mansilla, Valeria Tellone, Sara Fioravanti, Giorgio Di Loreto, Alessandro Comandini