A Major Subset of Mutated CLL Expresses Affinity-selected and Functionally Proficient Rheumatoid Factors - Jerry Janssen; Naomi Donner; Zhen Li; Thera A.M. Wormhoudt; Koen Wagner; Jeroen E.J. Guikema; C. Ellen van der Schoot; Arnon P. Kater; Ten Feizi; Richard J. Bende; Carel J.M. van Noesel (HemaSphere, 2021)