Acquired von Willebrand syndrome in haematologic malignancies – how the clinical‐laboratory correlation improves a challenging diagnosis – a case series. Issue 4 (12th May 2017) - Fidalgo, T.; Ferreira, G.; Oliveira, A. C.; Silva Pinto, C.; Martinho, P.; Mendes, M. J.; Duarte, M.; Salvado, R.; Ribeiro, M. L.