Drawings : notice the distance between the nock and the eye .
图:注意箭扣与眼睛之间的距离。
The lead investigator was matthew nock , ph.d. , an associate professor of social sciences at harvard university .
首席研究员是matthewnock博士,哈佛大学社会科学副教授。
Now nock , kessler , and several other harvard colleague shave analyzed ncs-r material and determined which mental disorders are the strongest predictors of suicidal behaviors .