Inclusion Criteria:  Patients diagnosed with DLBCL or FL between January 1, 2010 and December 31, 2017, Alive as of January 1, 2021, Updated patient address.  Exclusion Criteria:  Other forms of Hematologic Malignancies at diagnosis, Minors. Person subject to legal protection (curatorship, guardianship) Person subject to a judicial safeguard measure Pregnant, parturient or breastfeeding woman Adults incapable of giving consent