SIC - fixed RI wage index average
Surgery - added counts of procedures per BID

Index surgery is most recent one, but added counts of all qualifying
surgeries to the dataset
Did a few counts 1. unique procedures 2. unique procedure dates 3.
unique claims with a qualifying procedure
Updated typo in the work from this morning re the new discharge code
categorical variable
Rearranged variables in the v3 analysis section to match the
format/order in the draft paper