Table 2.

The evaluation criteria of FSE.

Score	Criteria
0	There are obvious errors in the boundaries of the four sides.
1	There are errors in the boundaries of four sides, but better than 0.
2	Only one side is accurate enough *
3	Two sides are accurate enough.
4	Three sides are accurate enough.
5	All sides are accurate enough.

* Accurate enough: according to the subjective evaluation of clinician, it would not affect the subsequent diagnosis.