The Vancouver system lists the cited references at the end of the text and the references are listed numerically.
Citing Medicine does not specify a heading for the reference list. Most journals use the heading References (or sometimes REFERENCES).
Citing Medicine does not specify line spacing or paragraph indenting. (These are normally specified by individual journals in their instructions to authors.)
Always check to see if you are required to use a specific heading or formatting for your reference list, either in your student handbook or the instructions for a particular assignment. Consult your lecturer/supervisor if in any doubt.
Example of how it might be laid out:
References