MEDLINE	EMBASE	PsycINFO	CENTRAL
9. recurrence/	9. recurrent disease/ or relapse/	9. (recur$ or relaps$ or recrudesc$).mp.	#11. (recur* or relaps* or recrudesc* or maintenance or prophyla* or continuation)
10. (recur$ or relaps$ or recrudesc$).ti,ab.	10. (recur$ or relaps$ or recrudesc$).ti,ab.	10. (maintenance$ or prophyla$ or  contin$ or discontinue$).ti,ab.	#12. (prevent* NEAR/7 (recur* or relaps* or remis* or episode*))
11. (maintenance$ or prophyla$ or prevent$ or continu$ or discontinu$).ti,ab.	11. (maintenance$ or prophyla$ or  continuation).ti,ab.	11. (prevent$ adj7 (recur$ or relaps$ or remis$ or episode$)).ti,ab.	#13. (#11 or #12)
12. or/9‐11	12. (prevent$ adj7 (recur$ or relaps$ or remis$ or episode$)).ti,ab.	12. or/9‐11
	13. or/9‐12