Foga

use of `scoped_session` (see [this SO answer](https://stackoverflow.com/questions/34009296/using-sqlalchemy-session-from-flask-raises-sqlite-objects-created-in-a-thread-c)) ?

Dear @zsyzzsoft , thanks for the implementation of your paper! I'm also interested in the landmarks in SLIVER that you already used in VTN (Unsupervised 3D End-to-End Medical Image Registration...