The half-life of maternal transplacental antibodies against diphtheria, tetanus, and pertussis in infants: an individual participant data meta-analysis by Oguti, B, Ali, A, Andrews, N, Barug, D, Anh Dang, D, Halperin, SA, Thu Hoang, HT, Holder, B, Kampmann, B, Kazi, AM, Langley, JM, Leuridan, E, Madavan, N, Maertens, K, Maldonado, H, Miller, E, Munoz-Rivas, FM, Omer, SB, Pollard, AJ, Rice, TF, Rots, N, Sundaram, ME, Wanlapakorn, N, Voysey, M