title: Long-term quality-control charting: a simple method.
mesh_terms: D001296:Audiovisual Aids; D001774:Blood Chemical Analysis / Q000592:standards*; D002712:Chlorides / Q000097:blood*; D003404:Creatinine / Q000097:blood*; D006801:Humans; D011188:Potassium / Q000097:blood*; D011786:Quality Control; D013223:Statistics as Topic
chemical_list: D002712:Chlorides; D003404:Creatinine; D011188:Potassium