首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   6660篇
  免费   456篇
  国内免费   21篇
耳鼻咽喉   59篇
儿科学   182篇
妇产科学   185篇
基础医学   925篇
口腔科学   89篇
临床医学   659篇
内科学   1461篇
皮肤病学   127篇
神经病学   654篇
特种医学   132篇
外科学   658篇
综合类   57篇
一般理论   3篇
预防医学   877篇
眼科学   93篇
药学   469篇
中国医学   32篇
肿瘤学   475篇
  2024年   14篇
  2023年   97篇
  2022年   141篇
  2021年   284篇
  2020年   175篇
  2019年   229篇
  2018年   251篇
  2017年   186篇
  2016年   159篇
  2015年   215篇
  2014年   256篇
  2013年   377篇
  2012年   568篇
  2011年   538篇
  2010年   328篇
  2009年   290篇
  2008年   431篇
  2007年   402篇
  2006年   384篇
  2005年   380篇
  2004年   323篇
  2003年   270篇
  2002年   244篇
  2001年   59篇
  2000年   44篇
  1999年   59篇
  1998年   41篇
  1997年   22篇
  1996年   35篇
  1995年   31篇
  1994年   26篇
  1993年   19篇
  1992年   19篇
  1991年   27篇
  1990年   31篇
  1989年   29篇
  1988年   22篇
  1987年   14篇
  1986年   15篇
  1985年   7篇
  1984年   8篇
  1983年   9篇
  1980年   5篇
  1979年   5篇
  1976年   6篇
  1975年   6篇
  1974年   5篇
  1973年   7篇
  1971年   10篇
  1969年   6篇
排序方式: 共有7137条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.

Background

Payers frequently rely on budget impact model (BIM) results to help determine drug coverage policy and its effect on their bottom line. It is unclear whether BIMs typically overestimate or underestimate real-world budget impact.

Objective

We examined how different modeling assumptions influenced the results of 6 BIMs from the Institute for Clinical and Economic Review (ICER).

Study Design

Retrospective analysis of pharmaceutical sales data.

Methods

From ICER reports issued before 2016, we collected estimates of 3 BIM outputs: aggregate therapy cost (ie, cost to treat the patient population with a particular therapy), therapy uptake, and price. We compared these against real-world estimates that we generated using drug sales data. We considered 2 classes of BIM estimates: those forecasting future uptake of new agents, which assumed “unmanaged uptake,” and those describing the contemporaneous market state (ie, estimates of current, managed uptake and budget impact for compounds already on the market).

Results

Differences between ICER's estimates and our own were largest for forecasted studies. Here, ICER's uptake estimates exceeded real-world estimates by factors ranging from 7.4 (sacubitril/valsartan) to 54 (hepatitis C treatments). The “unmanaged uptake” assumption (removed from ICER's approach in 2017) yields large deviations between BIM estimates and real-world consumption. Nevertheless, in some cases, ICER's BIMs that relied on current market estimates also deviated substantially from real-world sales data.

Conclusions

This study highlights challenges with forecasting budget impact. In particular, assumptions about uptake and data source selection can greatly influence the accuracy of results.  相似文献   
5.
Hypoxia is related to poor prognosis because it is associated to chemo-and radioresistance. During recent years the evolution of imaging methods like PET/CT and MRI has meant the appearance of new perspectives with direct implications in radiation therapy. We discuss previous experiences in staging, planning and in the follow-up process with these techniques for measuring tumour hypoxia.  相似文献   
6.
Pseudomembranous colitis is not a rare complication of antibiotic therapy. 2000 surgical procedures with implantation of grafts in the aorto-iliac region were performed from 1974 through 1988; during this period 11 cases of CMP were observed. The Authors report their experience in regard to the various antibiotics administered.  相似文献   
7.
8.
Toxicity testing of sediment samples from the Rio Santiago and its main tributaries was performed using a battery of tests that included the ECHA dipstick biocide monitor, the MetPad test, the lettuce seed germination and the root elongation test, the nematode test, spot plate test, and the SOS Chromotest. Assessment was carried out on organic extracts, pore water, and direct sediment. Results of bioassays showed toxicity sources from tributaries and canals flowing into the river and areas being degraded by insults from industrial spills. © by John Wiley & Sons, Inc.  相似文献   
9.
Abstract Pericardial tamponade remains a diagnostic challenge to the clinician especially when the patient is well compensated hemodynamically. We report an unusual case who sought medical help 1 month after having been stabbed in his chest. An investigation revealed a perforation of the myocardium and a pericardial tamponade. The patient survived thanks to a large organized clot that plugged the perforation. The patient was exposed to increased risk due to delayed onset, recognition, and therapy of the tamponade. Most reports on this subject deal with acute pericardial tamponade. Only few cases of delayed pericardial tamponade have been reported. A review of the relevant literature and the therapeutic approaches are discussed.  相似文献   
10.
A study of some antiparasitic properties of several homoallylamines and related tetrahydroquinolines and quinolines, previously described, was carried out using in vitro activity assays against the epimastigote form of Trypanosoma cruzi and against Trichomonas vaginalis. Unspecific cytotoxicity against murine macrophages was also studied. Although the antichagasic and trichomonacidal activities are not comparable to those of the standard drugs, nifurtimox and metronidazole, some of the compounds exhibit an interesting specific antiparasitic activity.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号