Monoclonal B-lymphocytosis in patients aged over 90 years is common but not inevitable, and has a prevalence comparable to that in individuals aged 65–90 years. Issue 7 (July 2015) - Soosapilla, Asha; Pepperell, Dominic; Best, Giles; Brizzi, Carmela; Mulligan, Christopher S.; van Bilsen, Nenna; Mulligan, Stephen P.