Footnotes

• Handling editor Runjan Chetty.

• Contributors SAP wrote the initial draft. PW offered comments to improve the draft. SAP, TC and AM evaluated the histology slides. BB and PAA evaluated the immunofluorescence. SC and TRS offered clinical inputs. All authors have contributed to the manuscript and have seen the final version and approved of it.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests TC and PW are associated with Arkana Labs, USA, where the immunostains were done.

• Provenance and peer review Not commissioned; internally peer reviewed.