Etiologies and diagnostic work‐up of extreme macrocytosis defined by an erythrocyte mean corpuscular volume over 130°fL: A study of 109 patients. Issue 6 (18th April 2014) - Planche, Virginie; Georgin‐Lavialle, Sophie; Avillach, Paul; Ranque, Brigitte; Pavie, Juliette; Caruba, Thibaut; Darnige, Luc; Pouchot, Jacques