What is the fine-grained topic of the following text: Unfortunately the full BTK team was unable to make it down to LA this year for the American Society of Colon and Rectal Surgeons meeting, but we were able to track down a few people to talk to who not only attended the conference, but also had a hand in planning! Only return the topic.
The BTK team's absence and interaction at the American Society of Colon and Rectal Surgeons meeting.