James Bentham, a co-author of the research from Imperial College, London, says the global trend is likely to be due primarily to improvements in nutrition and healthcare.

伦敦帝国理工学院的詹姆斯·边沁是这项研究的合著者之一。他表示，这种全球趋势可能主要归因于营养和医疗条件的改善。

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"Incompetence alone doesn't lead to aggression," said Serena Chen, associate professor of psychology at University of California and co-author of the study.

“仅仅是无能不会导致侵犯，”塞丽娜·陈说。她是加利福尼亚大学心理学副教授，该研究报告的合著者。

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“One way he does this is by setting up common enemies,” says Alessandro Trocino, co-author of a recent book on the League.

亚历山德罗•特罗奇诺，是最近一本关于联盟的书的作者之一，他说：“博西的一种做法就是树立共同的敌人。”

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Co-lead author Elizabeth Costello, now at Stanford, was at the University of Colorado when the study was done.

VOA: standard.2010.06.30

Lubetkin and her co-author based their findings on a massive collection of data, covering 3.5 million people.

VOA: standard.2010.08.10

According to study co-author Sangwon Suh at the University of California, Santa Barbara.

VOA: standard.2010.06.04

Christensen is the Robert Jane Cizik professor of business administration at the Harvard Business School and author or co-author of five books including The New York Times best sellers The Innovator's Dilemma and The Innovator's Solution.

FORBES: Magazine Article

She is the author of 3 books, and co-author of 1, on various aspects of building an inside sales organization, both within the US and abroad.

FORBES: 5 Disruptive Essentials of a High Velocity Sales Model

He has been author and co-author of a range of guidance booklets for teachers and has undertaken education advisory work in the Russian Federation and Georgia on behalf of the Council of Europe.

UNESCO: Who's who