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. 2010 Oct 12;9:229–249. doi: 10.4137/CIN.S5614
2 2 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3
2 3 3 3 3 3 3 3 3 3 2 2 2 2 2 2 2 2 2 2
1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4
5 5 5 5 5 2 2 2 2 2 2 2 2 2 2 3 3 3 3 3
1 1 1 1 1 3 3 3 3 3 2 2 2 2 2 2 2 2 2 2