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. 2017 Jun 20;18(Suppl 3):280. doi: 10.1186/s13063-017-1978-4

Table 2.

Number of years searched (n = 33)

Number of years searched Frequency
Less than 5 1
5 to 9 3
10 to 14 12
15 to 19 2
20 to 24 6
25 to 29 1
30 to 34 1
35 to 39 4
More than 40 3