 Group 3 Placebo MAT placebo LAT: Subjects will serve as a placebo control and will receive LAT at power off mode i.e. deactivated laser for acupoint stimulation before the application of plasters centred with a small portion of Junci Medulla mimicking the MAT treatment. Junci Medulla is the dried stem of the perennial plant that is soft in texture. It has been successfully adopted as a placebo in a previous study conducted by the PI because it does not induce any physical pressure on the acupoints of the ear Suen et al., 2002a. 