Among classic myeloproliferative neoplasms, essential thrombocythemia is associated with the greatest risk of venous thromboembolism during COVID-19 - Barbui, Tiziano (Papa Giovanni XXIII Hospital. FROM Research Foundation) ; De Stefano, Valerio (Fondazione Policlinico "A. Gemelli" IRCCS. Section of Hematology, Department of Radiological and Hematological Sciences, Catholic University) ; Alvarez-Larran, Alberto (Hospital Clínic i Provincial de Barcelona) ; Iurlo, Alessandra (Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico. Hematology Division) ; Masciulli, Arianna (Papa Giovanni XXIII Hospital. FROM Research Foundation) ; Carobbio, Alessandra (Papa Giovanni XXIII Hospital. FROM Research Foundation) ; Ghirardi, Arianna (Papa Giovanni XXIII Hospital. FROM Research Foundation) ; Ferrari, Alberto (Papa Giovanni XXIII Hospital. FROM Research Foundation) ; Cancelli, Valeria (Spedali Civili) ; Elli, Elena Maria (Ospedale San Gerardo (Itàlia)) ; Andrade-Campos, Marcio Miguel (Institut Hospital del Mar d'Investigacions Mèdiques) ; Kabat, Mercedes Gasior (Hospital Universitario La Paz (Madrid)) ; Kiladjian, Jean-Jaques (Hospital Saint-Louis) ; Palandri, Francesca (Azienda Ospedaliero-Universitaria di Bologna) ; Benevolo, Giulia (AOU Città della Salute e della Scienza di Torino) ; Garcia-Gutierrez, Valentin (Hospital Universitario Ramón y Cajal (Madrid)) ; Fox, Maria Laura (Vall d'Hebron Institut d'Oncologia) ; Foncillas, Maria Angeles (Hospital Universitario Infanta Leonor) ; Morcillo, Carmen Montoya (Complejo Hospitalario Universitario de Albacete) ; Rumi, Elisa (University of Pavia. Department of molecular medicine) ; Osorio, Santiago (Hospital General Universitario Gregorio Marañón) ; Papadopoulos, Petros (Hospital Clínico San Carlos (Madrid)) ; Bonifacio, Massimiliano (Ospedale Policlinico "G.B. Rossi", Borgo Roma) ; Quiroz Cervantes, Keina (Hospital Universitario de Móstoles (Madrid)) ; Serrano, Miguel Sagues (Hospital de Sant Joan Despí Moisès Broggi) ; Carreño-Tarragona, Gonzalo (Hospital Universitario 12 de Octubre (Madrid)) ; Sobas, Marta Anna (Wroclaw Medical University. Department of Hematology, Blood Neoplasms and Bone Marrow Transplantation) ; Lunghi, Francesca (IRCCS Ospedale San Raffaele) ; Patriarca, Andrea (AOU Maggiore della Carità, Novara, Italy) ; Elorza, Begoña Navas (Hospital Moncloa, Madrid, Spain) ; Angona, Anna (Hospital Universitari de Girona Doctor Josep Trueta) ; Mazo, Elena Magro (Hospital Universitario Príncipe de Asturias (Alcalá de Henares, Madrid)) ; Koschmieder, Steffen (RWTH Aachen University. Department of Hematology, Oncology, Hemostaseology, and Stem Cell Transplantation, Faculty of Medicine) ; Carli, Giuseppe (Ospedale San Bortolo) ; Cuevas, Beatriz (Hospital Universitario de Burgos) ; Hernandez-Boluda, Juan Carlos (Hospital Clínic Universitari (València)) ; Abadia, Emma Lopez (Hospital General Universitario de Elche) ; Xicoy, Blanca (Institut Germans Trias i Pujol. Institut de Recerca contra la Leucèmia Josep Carreras) ; Guglielmelli, Paola (University of Florence. Center Research and Innovation of Myeloproliferative Neoplasms (CRIMM), Department of Experimental and Clinical Medicine, Azienda Ospedaliera Universitaria Careggi) ; Garrote, Marta (Hospital Clínic i Provincial de Barcelona) ; Cattaneo, Daniele (Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico. Hematology Division) ; Daffini, Rosa (Spedali Civili) ; Cavalca, Fabrizio (Ospedale San Gerardo (Itàlia)) ; Bellosillo Paricio, Beatriz (Institut Hospital del Mar d'Investigacions Mèdiques) ; Benajiba, Lina (Hospital Saint-Louis) ; Curto-Garcia, Natalia (Guy's and St. Thomas' NHS Foundation Trust) ; Bellini, Marta (ASST Papa Giovanni XXIII, Bergamo, Italy) ; Betti, Silvia (Fondazione Policlinico "A. Gemelli" IRCCS. Section of Hematology, Department of Radiological and Hematological Sciences, Catholic University) ; Harrison, Claire (Guy's and St. Thomas' NHS Foundation Trust) ; Rambaldi, Alessandro (Università degli Studi di Milano) ; Vannucchi, Alessandro Maria (University of Florence. Center Research and Innovation of Myeloproliferative Neoplasms (CRIMM), Department of Experimental and Clinical Medicine, Azienda Ospedaliera Universitaria Careggi) ; Universitat Autònoma de Barcelona