Serotonin transporter gene (SLC6A4) polymorphism and susceptibility to a home-visiting maternal-infant attachment intervention delivered by community health workers in South Africa: Reanalysis of a randomized controlled trial

B. Morgan, R. Kumsta, P. Fearon, D. Moser, S. Skeen, P. Cooper, L. Murray, G. Moran, M. Tomlinson