Search combinations	Search results	Title /abstract	Full text	Included
(3 OR 4 OR 5 OR 6) AND (1 OR 2 OR 7 OR 8) AND 10	13	7	4	1
(3 OR 4 OR 5 OR 6) AND (1 OR 2 OR 7 OR 8) AND 11	8	7	5	3
(3 OR 4 OR 5 OR 6) AND (1 OR 2 OR 7 OR 8) AND 12 OR 13 AND 9	48	11	9	7
(3 OR 4 OR 5 OR 6) AND (1 OR 2 OR 7 OR 8) AND 14	77	34	26	11
(3 OR 4 OR 5 OR 6) AND (1 OR 2 OR 7 OR 8) AND 17	18	16	1	0
(15 OR 16) AND 1 AND 9	86	47	24	15
1 AND 7 AND 19	29	13	10	7
1 AND 7 AND 20	42	23	18	12
(15 OR 16) AND 9				2
12 (freehand)				3