Kricheldorf K, Döhner K, Stegelmann F, Jost PJ, Lang F, Radsak M, Hansen R, Heuer V, Röhrig R, Brümmendorf TH, et al. Challenges of patients with myeloproliferative neoplasms (MPN) in times of COVID: First results from a patient survey by the German Study Group for MPN. Leuk Res. 2021;110:106646.