Database: scholar
Question: Give me the papers written by Su-In Lee before 2012 .
SQL:
SELECT DISTINCT t3.paperid FROM writes AS t2 JOIN author AS t1 ON t2.authorid  =  t1.authorid JOIN paper AS t3 ON t2.paperid  =  t3.paperid WHERE t1.authorname  =  "Su-In Lee" AND t3.year  <  2012;