In the classical sense, the set B consists of all integers which can be written as a sum of two perfect squares. In other words, these are the values attained by norms of integral ideals over the Gaussian field Q(i) . G.J. Rieger (1965) and T. Cochrane / R.E. Dressler (1987) established bounds for the number of pairs (n, n+h) , resp., triples (n, n+1, n+2) of B -numbers up to a large real param...

The Cochrane Library. The single most reliable source of evidence in healthcare The Cochrane Reviews highlighted below are available from the Cochrane Database of Systematic Reviews (www.thecochranelibrary.com) Cochrane Reviews are regularly updated as new evidence emerges and in response to feedback, and the Cochrane Database of Systematic Reviews should always be consulted for the most recent...

Introduction In his seminal work Effectiveness and Efficiency, Archie Cochrane asked why, despite their enormous potential, randomized trials were much less widely used that they should be. At the time that he was writing, their geographical distribution was very uneven. He wrote ‘If some such index as the number of RCTs per 1,000 doctors per year for all the countries of the world were worked ...

The Statistical Methods Group has played a pivotal role in The Cochrane Collaboration over the past 20 years. The Statistical Methods Group has determined the direction of statistical methods used within Cochrane reviews, developed guidance for these methods, provided training, and continued to discuss and consider new and controversial issues in meta-analysis. The contribution of Statistical M...

BACKGROUND Cochrane Systematic Reviews (CSRs) are frequently referenced by acupuncture efficacy studies currently. In this study, the CSRs on acupuncture are reviewed, and the disease fields they covered and the conclusions they reached are analyzed. In order to explore the potential contribution to CSRs by Chinese resources, the authors analyzed whether the participation of Chinese reviewers, ...