title: Letter: An improvement in lipid classes determination.
mesh_terms: D002784:Cholesterol / Q000032:analysis* / Q000097:blood; D003978:Diazomethane; D005230:Fatty Acids, Nonesterified / Q000032:analysis* / Q000097:blood; D006801:Humans; D007202:Indicators and Reagents; D008745:Methylation
chemical_list: D005230:Fatty Acids, Nonesterified; D007202:Indicators and Reagents; D003978:Diazomethane; D002784:Cholesterol