When reporting experiments on human subjects, indicate whether the procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional or regional) and with the Helsinki Declaration of 1975, as revised in 1983. Do not use patients’ names, initials, or hospital numbers, especially in illustrative materials. When reporting experiments on animals, indicate whether the institution’s or a national research council’s guide for, or any national law on, the care and use of laboratory animals was followed.