title: Correspondence (letter to the editor): historically unique.
authors.forename: Johannes
authors.initials: J
authors.lastname: Gossner
mesh_terms: D005251:Fees, Medical / Q000639:trends*; D005382:Financing, Personal / Q000191:economics*; D005858:Germany; D006801:Humans; D007182:Income; D019458:Insurance Coverage / Q000191:economics*; D009313:National Health Programs / Q000191:economics*; D010817:Physician-Patient Relations; D011331:Private Practice / Q000191:economics*; D019564:Unnecessary Procedures / Q000191:economics