“…For further enhancement, hospitals may collaborate to generate a more accurate classification model by combining their datasets. However, such collaboration will raise privacy concerns that are related to patients' records [Alabdulkarim, Al-Rodhaan and Tian (2017); Liang, Lu, Chen et al (2011); Liu, Lu, Ma et al (2016); Lu, Lin and Shen (2013)]. The privacy of shared data is a serious issue [Ma, Zhang, Cao et al (2015); Rong, Ma, Tang et al (2018); Xiong and Shi (2018)]; thus, privacy preserving algorithms for securing data-mining techniques enable the extraction of hidden patterns from a dataset without actually accessing it [Zhang, Tong, Tang et al (2005)].…”