The details of this research, as published in the 21st issue of the Journal of American Medical Association, indicated that the participants were separated into two groups. One group was given gingko while the other group was given placebo.

• 据二十一日出版的美国医学会杂志刊出的此项研究细节说，而后他们分成两组，第一组服用银杏胶囊，另一组服用安慰剂。