1. Division of Maternal-Fetal Medicine; Department of Obstetrics and Gynecology; Massachusetts General Hospital; Boston MA USA
2. Department of Environmental Health; Harvard T.H. Chan School of Public Health; Boston MA USA
3. Muhimbili University of Health and Allied Sciences; Dar es Salaam Tanzania
4. Africa Academy of Public Health; Mikocheni Dar es Salaam Tanzania
5. Department of Biostatistics; Harvard T.H. Chan School of Public Health; Boston MA USA
6. Department of Global Health and Population; Harvard T.H. Chan School of Public Health; Boston MA USA
7. MRC-PHE Centre for Environment and Health; School of Public Health; Imperial College London; Norfolk Place London UK