Practical considerations for measuring the effective reproductive number, Rt by Gostic, KM, McGough, L, Baskerville, EB, Abbott, S, Joshi, K, Tedijanto, C, Kahn, R, Niehus, R, Hay, JA, De Salazar, PM, Hellewell, J, Meakin, S, Munday, JD, Bosse, NI, Sherrat, K, Thompson, RN, White, LF, Huisman, JS, Scire, J, Bonhoeffer, S, Stadler, T, Wallinga, J, Funk, S, Lipsitch, M, Cobey, S