note: It is desirable Authors Articles Trustee in writing to artical. We welcome detailed explanations of how investigators and authors have considered and justified the ethical and moral basis of their work. If such detail does not easily fit into the manuscript please provide it in the covering letter or upload it as a supplemental file when submitting the article. We will also be pleased to see copies of explanatory information given to participants. Even if we do not include such detailed information in a final published version, we may make it available to peer reviewers and editorial committees. We already ask peer reviewers to consider and comment on the ethics of submitted work.