S281: PRIOR EXPOSURE TO IMMUNOSUPPRESSIVE AGENTS AND COMORBIDITIES ARE ASSOCIATED WITH WORSE OUTCOMES OF SARS-COV2 INFECTION IN PH-NEG CHRONIC MYELOPROLIFERATIVE NEOPLASMS: RESULTS OF EPICOVIDEHA SURVEY. (23rd June 2022) - Marchetti, M.; Salmanton-García, J.; El-Ashwah, S.; Sacchi, M. V.; Marchesi, F.; Ráčil, Z.; Hanakova, M.; Zambrotta, G.; Verga, L.; Passamonti, F.; Itri, F.; Van Doesum, J.; et al.