1 School of Population and Public Health, The University of British Columbia, 314 - 2206 East Mall, Vancouver, BC V6T 1Z3, Canada; Department of Forest and Conservation Sciences, The University of British Columbia, 3041-2424 Main Mall, Vancouver, BC V6T 1Z4, Canada. Electronic address: Matilda.vandenbosch@ubc.ca.
2 ISGlobal CREAL, Barcelona Biomedical Research Park (PRBB), Doctor Aiguader 88, 08003 Barcelona, Spain. Electronic address: mark.nieuwenhuijsen@isglobal.org.