Affiliation: | (1) Division of Health Services Research, Department of Family and Community Medicine, Texas Tech University Health Sciences Center, 3601 4th St, STOP 8161, Lubbock, TX 79430, USA;(2) Department of Community Health and Epidemiology, Institute of Agriculture Rural Environmental Health, University of Saskatchewan, College of Medicine, Saskatoon, SK, Canada, S7N-OW8 |