While glyphosate and formulations such as Roundup have been approved by regulatory bodies worldwide, concerns about their effects on humans and the environment persist, and have grown as the global usage of glyphosate increases. A number of regulatory and scholarly reviews have evaluated the relative toxicity of glyphosate as an herbicide. The German Federal Institute for Risk Assessment toxicology review in 2013 found that with regard to positive correlations between exposure to glyphosate formulations and risk of various cancers, including non-Hodgkin lymphoma "the available data is contradictory and far from being convincing". A meta-analysis published in 2014 identified an increased risk of NHL in workers exposed to glyphosate formulations.