1. Department of Water Resources and Drinking Water, Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland.
2. Department of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK.
3. UNESCO Chair on Groundwater Arsenic within the 2030 Agenda for Sustainable Development and School of Civil Engineering and Surveying, University of Southern Queensland, Toowoomba, QLD 4350, Australia.