# Intro

# Lit Review

# Causal Identification
https://xkcd.com/2726/

Because running an experimental trial on how clinical trial recruitment and
drugs on market affect clinical trial completion is going to be nigh impossible.
Finding natural experiments may also be difficult.
Instead going to use a structural approach based on Pearl's Do-Calculus.

Background on backdoor criterion. #can be ignored in this draft?

Present Graph

Discuss adjustment sets for total vs direct effects.

# Conclusion

# Appendix
Include table of ?? Hierarchy

# References