How to randomize: The online random number generation site at the address kitset.ir/numbers/random was used and the no duplicate numbers were ticked and 15 numbers were selected among 30 subjects and numbers of 15,9,28,8,16,13,12,30,11,3,21,29,26,5,1 were placed in the test group and numbers of 14,6,18,7,4,27,20,10,2,23,17,19,25,24,22 were placed in the control group.