<qa>  What is the purpose-to-treat population?5. Statistical analysis: The statisticians will be blinded to the allocation of the participants. Statistics Package for Social Science SPSS19.0 statistical software packages will be used to analyze the data. The intention-to-treat population will include all randomized patients who receive the assigned treatment at least once, and who have an evaluation of outcomes. The measurement data will be analyzed by using t-test or the rank sum test, and the numeration data will be analyzed by using chi-square test or Fishers exact test. P0.05 indicates statistical significance. 