: Refers to a new event, diagnosis, or publication date of December 2021 . Relevant Clinical Context
: This likely marks the date of a new report, diagnosis, or treatment start (December 2021). Overview of the Clinical Context kdv rbv n127 boy 16yo with 10yo hc new 12 2021
The write-up appears to be in a coded or abbreviated format, possibly from an online platform or community. Here's my attempt to break it down: : Refers to a new event, diagnosis, or