Platelet Count in Patients with Mild Disease at Admission is Associated with Progression to Severe Hantavirus Cardiopulmonary Syndrome oleh René López, Cecilia Vial, Jerónimo Graf, Mario Calvo, Marcela Ferrés, Gregory Mertz, Analía Cuiza, Begonia Agüero, Dante Aguilera, Diego Araya, Ignacia Pailamilla, Flavia Paratori, Víctor Torres-Torres, Pablo A Vial, Hantavirus Study Group in Chile