Social Distancing 2.0 with Privacy-Preserving Contact Tracing to Avoid a Second Wave of COVID-19. - Yu-Chen Ho; Yi-Hsuan Chen; Shen-Hua Hung; Chien-Hao Huang; Poga Po; Chung-Hsi Chan; Di-Kai Yang; Yi-Chin Tu; Tyng-Luh Liu; Chi-Tai Fang (CoRR, 2020)