Database: Ovid MEDLINE(R) < 1975–2010> Search Strategy #1: Costs.
#	Searches	Results
1	exp certificate of need/	801
2	“certificate of need”.mp.	886
3	1 or 2	886
4	(cost$ or burden$ or impact$).mp.	736,742
5	exp “costs and cost analysis”/	157,748
6	ec.fs.	287,061
7	4 or 5 or 6	885,552
8	3 and 7	368
9	..l/ 8 lg = en	366
10	..l/ 9 yr = 1975–2004	325
11	..l/ 9 yr = 2005–2010	40