Aesthetic medicine (Botox / dermal fillers) has impressively high salesforce efficiency; hence the high SER for AGN in the table in msg #51447.
I would expect general dermatology to have a high SER too, which is good for MRX. For some reason, MRX is not shown in the table in msg #51337, but I would guess it would rank at or near the top of the companies profiled in the Morningstar article.