Database: hospital_1
Question: Among the procedures that cost more than 1000, which were not specialized in by physician John Wen?
SQL: select name from procedures where cost  >  1000 except select t3.name from physician as t1 join trained_in as t2 on t1.employeeid  =  t2.physician join procedures as t3 on t3.code  =  t2.treatment where t1.name  =  "john wen"