Fig. 1From: Beneficial biological effects and the underlying mechanisms of molecular hydrogen - comprehensive review of 321 original articles -Profiles of 321 original articles up to June 2015 showing therapeutic effects of molecular hydrogen. a Temporal profile of countries where the studies are reported from 2007 to June 2015. b Biological species used in the studies. c Modalities of hydrogen administration to model animals, humans, and plantsBack to article page