Table 5.

Distribution of connections between FHL and FDL in previous studies.

Study	N	Type 1 (%)	Type 2 (%)	Type 3 (%)	Type 4 (%)	Type 5 (%)	Type 6 (%)	Type 7 (%)
This study	20	75	10	0	0	5	5	5
Edama et al. 17	100	86	3	0	0	11	0	0
LaRue et al. 18	24	42	41	0	17	0	0	0
Mao et al. 6	64	96	4	0	0	0	0	0
Martin 19	33	88	6	0	6	0	0	0
Mulier et al. 20	24	58	29	0	13	0	0	0
O'Sullivan et al. 21	16	68	19	13	0	0	0	0
Plaass et al. 8	60	67	30	3	0	0	0	0

N: number of sides.