Maria Wallin and others, Low-Level Cadmium Exposure and Effects on Kidney Function., Occupational and environmental medicine, 71 (2014), 84854 .Shiv Shankar, Uma Shanker and Shikha, Arsenic Contamination of Groundwater: A Review of Sources, Prevalence, Health Risks, and Strategies for Mitigation., TheScientificWorldJournal, 2014 (2014), 304524 .