“…Some authors favour it (Vinnicombe, 1964;Farquharson, 1972), though others conclude that it is of no value (Brumer, 1970;Davidson et al, 1971;Farrar, 1973) or may even be detrimental (Gilmore and Martin, 1974). A controlled clinical trial is the only way of ascertaining the truth (Editorial, 1971).…”