Papers published under the Royal Society of Medicine's open access option (RSM Open) are now deposited in PubMed Central and mirrored to UKPMC.
The open access option is available to all authors and applies to all RSM journals.
The Article Processing Charge (APC) for RSM Open is $3000. All papers published under this model are licenced using the Creative Commons Attribution, Non-commercial licence.
A list of all papers published under this model is available here.