title: [A study on trace elements (Mn, As, Cd, Hg) contained in dental calculus].
mesh_terms: D001151:Arsenic / Q000032:analysis; D002104:Cadmium / Q000032:analysis; D003728:Dental Calculus / Q000032:analysis*; D006801:Humans; D007564:Japan; D008345:Manganese / Q000032:analysis; D008628:Mercury / Q000032:analysis; D014131:Trace Elements / Q000032:analysis*
chemical_list: D014131:Trace Elements; D002104:Cadmium; D008345:Manganese; D008628:Mercury; D001151:Arsenic