Just a quick note to readers that the comment engine that the NLM uses is undergoing a company transition. The result of this switchover seems to be that presently a thread may have more comments in it than is actually being reported. (For example, a present thread has over 40 comments but it is presently reporting only 20 comments. Likewise, some threads will show no comments even when there are some.)
This is somewhat out of my hands because the upgrade process is being controlled by the company in question. I am hopeful the process will go smoothly, but bear with us through the transition.
Do make sure to check the comments because they are not presently reporting accurately.