[Revise subclass] MONDO:0018702 a subclass of MONDO:0015564

[DnlRKorn]

Mondo term (ID and Label)
MONDO:0018702 should be made a subclass of MONDO:0015564

Suggested revision and reasons
"Recently, a unique clinicopathologic variant of multicentric Castleman's disease (MCD) has been identified in Japan." - PMID:23801135
It seems like this should be included somewhere in the Castleman hierarchy; maybe keeping it's current parent and also getting MONDO:0015564 as a parent.

Your nano-attribution (ORCID)
(https://orcid.org/)](https://orcid.org/0000-0002-1780-9872)