• Immunology (including allergy)
• other endocrinology
• drugs: endocrine system
• molecular genetics
• metabolic disorders

If you are wondering why a Polychronakos would have any personal interest in the existence and universal adoption of a code that uniquely and unambiguously identifies authors of scientific papers, just do a PubMed search on my surname without my initial.

There are four of us currently publishing: in addition to my C there is my brother V (an elementary-particle physicist), cousin A (ophthalmology) and another A, a prolific physicist whom I have never met. This does not include my late cousin D whose publications in obscure German or Greek journals can still be found at the chronological fringes of the PubMed search, or my father (yet another A) whose papers in French and Greek radiology …