iDASH secure genome analysis competition 2018: blockchain genomic data access logging, homomorphic encryption on GWAS, and DNA segment searching - Tsung-Ting Kuo; Xiaoqian Jiang; Haixu Tang; XiaoFeng Wang; Tyler Bath; Diyue Bu; Lei Wang; Arif Harmanci; Shaojie Zhang; Degui Zhi; Heidi J. Sofia; Lucila Ohno-Machado (BMC, 2020)