Statistical analysis
We used G Power (v. 3.1.9.7.; Franz Faul, Kiel University, Germany) to calculate statistical power a priori, and SPSS™ (v. 12.0.; IBM Corporation, Somers, NY USA) to test the difference between averaged measurements using parametric (one sample mean test, and independent samples t-test), and nonparametric (Mann–Whitney-U test) statistical tests.To find a medium effect size (In testing the interrater agreement, we interpreted the intraclass correlation coefficient (ICC) as acceptable (> 0.5), moderate (> 0.6), good (> 0.7), high (> 0.8), and excellent (> 0.9) [