Participants in each site and the general information of the patient survey.

1 USD = 6.8 RMB, M = Median.†GP was significantly higher than SL (χ2 = 8.409, P = 0.004), SC (χ2 = 14.952, P2 = 10.908, P = 0.001), SDC was significantly higher than SL (χ2 = 8.187, P = 0.004), SC(χ2 = 14.693, P2 = 10.627, P = 0.001).‡GP was significantly higher than SL (χ2 = 16.134, P2 = 7.825, P = 0.005). SDC was significantly higher than SL (χ2 = 17.868, P2 = 9.225, P = 0.002). ZD (χ2 = 37.013, P2 = 16.370, P2 = 26.889, P§Significantly difference was found among six sites (F = 11.907, P£SDC was significantly higher than ZD (χ2 = 20.685, P2 = 20.059, P2 = 11.009, P