Table 3.

Excluded articles and reasons for exclusion

First Author, Date	Reason for exclusion	First Author, Date	Reason for exclusion	First Author, Date	Reason for exclusion
Chang et al., 201711	2	Kumar et al., 201212	1	Tanimoto et al., 200613	4
Eraso et al., 200214		Lee et al., 200615		van der Stelt et al., 200816	4
Farkhondeh et al., 201517	4	Ludlow et al., 200018	4	Wenzel et al., 199719	3
Fleming et al., 200320	4	Ludwig et al., 201621	4	Wenzel et al., 200222	3
Foster et al., 201123	2 & 4	Miller et al., 199824	1	Wu et al., 200725	2
Gonzalez et al., 201626	2	Nilsson et al., 201127	1	Wu et al., 201028	2
Kavadella et al., 200729	1	Ramesh et al., 201630	2

1 = Not e-learning; 2 = Outcome measures not identified or no evaluation of learning approach; 3 = Follow-up-studies, not original study; 4 = not clear study design or development of tool not applied directly to dental undergraduate students.