BR/>Headings should be appropriate to the nature of the paper. In general those for experimental papers should follow the usual conventions. Other papers can be subdivided as the author desires; the use of headings enhances readability.
Normally only two categories of headings should be used: major ones should be typed in capital letters in the centre of the page and underlined; minor ones should be typed in lower case (with an initial capital letter) at the left hand margin and underlined.
Do not use "he", "his" etc where the sex of the person is unknown; say "the patient" etc. Avoid inelegant alternatives such as "he/she". Patients should not be automatically designated as "she", and doctors as "he".