In the acupressure group the acupoints and the number of the sessions will be exactly the same as for the verum acupuncture group. Acupressure will be applied on all the corresponding acupoints described in the acupuncture group. Finger pressure will be applied to each acupoint for eight seconds followed by two-seconds rest, repeated for 3 min. The strength of the pressure depends on individual participant's sensation of "de-qi". Duration of each session will be 15 min.