Specific contributions to a scientific article entitle the contributor to be included as an author; requests for authorship by those who have not made those specific contributions are unethical.
Retainer practices set an example to medical students and other providers that the highest level of physician satisfaction is available only to those who serve the wealthy.
A recent journal article calls for a public policy that would require physician-researchers to demonstrate the absence of undue influence or coercion on informed consent.