TY - RPRT TI - Competing effects of indirect protection and clustering on the power of cluster-randomized controlled vaccine trials AU - Hitchings, M. D. T. AU - Lipsitch, M. AU - Bellan, S. PY - 2017 DO - 10.1101/191163 UR - https://www.biorxiv.org/content/10.1101/191163v1 ID - 10.1101/191163 ER -