Commentary: Helling v. Carey, Caveat Medicus.

On a Phenomenon Discovered by Heinz Helling

The hyperbolic 3-manifolds fibered over the circle with fiber a once punctured torus are considered. Surprisingly, in all of about 200 cases, where the class numbers of their trace fields were calculated, they turned out to be equal to one. This is a report on the work of our friend Heinz Helling during the last several years. Unfortunately, for health problems he is unable to write about it hi...

CCR 20th Anniversary Commentary: Simpson's Paradox and Neoadjuvant Trials.

The research article by Carey and colleagues, published in the April 15, 2007, issue of Clinical Cancer Research, described the relationship between response to neoadjuvant chemotherapy and outcome by tumor subtype. Today neoadjuvant clinical trials are often designed to provide correlative data to help identify predictive biomarkers or to focus on poor-risk patients identified by residual dise...

Influence of a randomized clinical trial on practice by participating investigators: lessons from the Coronary Angioplasty Versus Excisional Atherectomy Trial (CAVEAT). CAVEAT I and II Investigators.

OBJECTIVES We sought to determine whether the results of the first Coronary Angioplasty Versus Excisional Atherectomy Trial (CAVEAT-I) influenced subsequent practice patterns among the investigators. BACKGROUND CAVEAT-I demonstrated that directional coronary atherectomy (DCA) resulted in higher rates of early complications at a higher cost and with no clinical benefit. We sought to determine ...

تعیین و مقایسه تعداد مقالات نمایه یا چکیده شده در زمینه مدارک پزشکی در منابع

Abstracts and indexes are the most important instrument in health information systems. There are some organizations that produce these tools which cover some part of users needs on this abilities and make them indexes or abstracts. For the university students and their teachers knowing new topics and the improvment in their specialize branches and for researchers knowing of the last Scienti...

Imaging cellular mechanisms of presynaptic structural plasticity