Positron emission tomography response and minimal residual disease impact on progression-free survival in patients with follicular lymphoma. A subset analysis from the FOLL05 trial of the Fondazione Italiana Linfomi - Stefano Luminari; Sara Galimberti; Annibale Versari; Irene Biasoli; Antonella Anastasia; Chiara Rusconi; Angela Ferrari; Mario Petrini; Martina Manni; Massimo Federico (Haematologica, 2016)