约翰霍普金斯大学布隆伯格公共卫生学院的社会流行病学家托马斯·格拉斯说：“大多数专家都认为这些变化与环境有关。”
"Most experts agree that the changes were related to something in the environment," says social epidemiologist Thomas Glass of The Johns Hopkins Bloomberg School of Public Health.
海斯·格尔公司的一个协会和哈佛公共卫生学院为此次研究提供了资金。
A HealthCore fellowship and the Harvard School of Public Health provided funding for the study.
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