Privacy preserving distributed learning classifiers-Sequential learning with small sets of data[J] COMPUTERS IN BIOLOGY AND MEDICINE 2021(136) Zerka, Fadila Urovi, Visara Bottari, Fabio Leijenaar, Ralph T. H. Walsh, Sean Gabrani-Juma, Hanif Gueuning, Martin Vaidyanathan, Akshayaa Vos, Wim Occhipinti, Mariaelena Woodruff, Henry C. Dumontier, Michel Lambin, Philippe