The editorial staff of The Journal reviewed a large number of recently published research studies related to the musculoskeletal system that received a Level of Evidence grade of I or II.

杂志评论员对最新发表的与骨骼肌肉系统相关的研究论文进行的回顾分析，其循证医学级别为I或II级水平。

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In an editorial accompanying the studies, Jerry Avorn and Aaron Kesselheim of Harvard Medical School and Brigham and Women's Hospital, Boston, questioned whether "improper" marketing may have contributed to the off-label use of NovoSeven.

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"It appears that this is a class effect, " New England Journal of Medicine Editor Jeffrey Drazen writes in a blunt editorial accompanying the three studies.

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While the Colorado researcher didn't know if the study participants were smokers or non-smokers, the CDC's editorial points out that the new study adds to research from eight other studies, which also saw a drop in heart attack related hospitalizations after smoke-free laws are enforced.

CNN: Study: Smoke-free laws may cut heart attack hospitalizations