Social contact patterns and implications for infectious disease transmission - a systematic review and meta-analysis of contact surveys by Mousa, A, Winskill, P, Watson, OJ, Ratmann, O, Monod, M, Ajelli, M, Diallo, A, Dodd, PJ, Grijalva, CG, Kiti, MC, Krishnan, A, Kumar, R, Kumar, S, Kwok, KO, Lanata, CF, de Waroux, OLP, Leung, K, Mahikul, W, Melegaro, A, Morrow, CD, Mossong, J, Neal, EF, Nokes, DJ, Pan-Ngum, W, Potter, GE, Russell, FM, Saha, S, Sugimoto, JD, Wei, WI, Wood, RR, Wu, J, Zhang, J, Walker, P, Whittaker, C