remove missing citation
Merge pull request #35 from sciunto/missing_citation

remove missing citation
Turn footnotes into numbers so paper can build
Merge pull request #37 from stefanv/build/footnotes

Turn footnotes into numbers so paper can build
Add affiliation for Warner & NIH acknowledgement.
Merge pull request #39 from JDWarner/add_warner_affil

Add affiliation for Warner & NIH acknowledgement.