title: Dangers of indirect data.
mesh_terms: D004723:Endorphins / Q000032:analysis; D006801:Humans; D010506:Periodicals as Topic / Q000592:standards; D012107:Research Design / Q000592:standards*; D012559:Schizophrenia / Q000097:blood / Q000235:genetics*
chemical_list: D004723:Endorphins