Many biomedical journals, including the JAMA (Journal of the American Medical Association) journals, require submitted papers to be formatted/referenced according to the AMA Manual of Style. If you're a researcher preparing a paper for one of these journals you might find the online version of the Manual useful.
Similarly, our Med students need to reference their assignments accurately in Vancouver style. The most useful resource for this is the Bond Vancouver Style Guide. That guide is based on the AMA Manual of Style, so if the guide doesn't answer your question, you could see if the Manual does. You'll be most interested in Chapter 3, References. And of course, you can always ask the library for assistance with your Vancouver referencing any time you need it.
You can always find the online AMA Manual of Style when you need it by searching Summon.