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   1001802篇
  免费   77125篇
  国内免费   2632篇
耳鼻咽喉   13032篇
儿科学   34632篇
妇产科学   28580篇
基础医学   146190篇
口腔科学   27907篇
临床医学   90766篇
内科学   194759篇
皮肤病学   23009篇
神经病学   79621篇
特种医学   38641篇
外国民族医学   308篇
外科学   150693篇
综合类   23783篇
一般理论   385篇
预防医学   78224篇
眼科学   22666篇
药学   72186篇
  3篇
中国医学   2035篇
肿瘤学   54139篇
  2018年   10667篇
  2017年   8345篇
  2016年   9454篇
  2015年   10707篇
  2014年   14564篇
  2013年   22200篇
  2012年   29245篇
  2011年   31134篇
  2010年   18656篇
  2009年   17593篇
  2008年   29038篇
  2007年   30785篇
  2006年   31237篇
  2005年   29916篇
  2004年   29179篇
  2003年   28053篇
  2002年   27056篇
  2001年   47158篇
  2000年   48230篇
  1999年   40463篇
  1998年   11254篇
  1997年   10182篇
  1996年   10224篇
  1995年   9826篇
  1994年   9129篇
  1993年   8520篇
  1992年   32347篇
  1991年   31556篇
  1990年   31126篇
  1989年   30000篇
  1988年   27268篇
  1987年   27435篇
  1986年   25536篇
  1985年   24706篇
  1984年   18489篇
  1983年   15584篇
  1982年   9318篇
  1981年   8404篇
  1979年   16933篇
  1978年   12265篇
  1977年   10363篇
  1976年   9779篇
  1975年   10221篇
  1974年   12372篇
  1973年   11892篇
  1972年   10944篇
  1971年   10132篇
  1970年   9421篇
  1969年   8764篇
  1968年   8143篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Introduction: Pharmacovigilance is essential to monitoring the safety profiles of authorized medicines. Compared with small-molecule drugs, biological drugs are more complex, more susceptible to structural variability due to manufacturing processes, and have the potential to induce immune-related reactions, underscoring the importance of safety monitoring for these products. Although highly similar to reference products, biosimilars are not expected to be structurally identical. For these reasons, proper reporting of potential adverse drug reactions (ADRs) using distinguishable names and batch numbers is essential for accurate tracing of all biological drugs. To address the need for robust pharmacovigilance, the European Parliament and Council of the European Union provided legislation regarding pharmacovigilance of biologics in 2010.

Areas covered: This narrative review examines the current state of pharmacovigilance for biologics in the European Union (EU) and discusses relevant information on pharmacovigilance of biosimilars, the current EU pharmacovigilance system, and areas that could be improved.

Expert opinion: Although steps have been taken to improve pharmacovigilance of biologics in the EU, several enhancements can still be made, including additional training for healthcare professionals on ADR reporting, the use of 2D barcodes that enhance traceability, and an open discussion of potentially missed opportunities in the pharmacovigilance of biosimilars.  相似文献   

12.
13.
14.
15.
16.
17.
18.

Objective

To examine whether a healthy weight intervention embedded in the Parents as Teachers (PAT) home visiting program, which was previously found to improve mothers’ body mass index (BMI) and obesity-related behaviors, changed the BMI of preschool children or maternal feeding practices.

Methods

This stratified randomized trial included preschool-aged children at risk for overweight whose mothers were overweight or had obesity (n?=?179). The Healthy Eating and Active Living Taught at Home (HEALTH) intervention was based on the Diabetes Prevention Program. Differences were examined using repeated-measures mixed-ANOVA models.

Results

Compared with PAT usual care, the HEALTH intervention had no effect on children's BMI or maternal feeding practices. However, combined analyses showed that children's BMI percentile decreased (P??=?.007), BMI z-scores were maintained (P??=?.19), and 3 of 8 feeding practices improved over time (P < .05).

Conclusions and Implications

Additional research is needed to assess the effectiveness of PAT to prevent preschool-age obesity using rigorous designs (eg, group-randomized trials) and to identify its active components. HEALTH is ready to be scaled up to prevent maternal weight gain through embedding within the national PAT program.  相似文献   
19.
20.

Objectives

Expedient extubation after cardiac surgery has been associated with improved outcomes, leading to postoperative extubation frequently during overnight hours. However, recent evidence in a mixed medical-surgical intensive care unit population demonstrated worse outcomes with overnight extubation. This study investigated the impact of overnight extubation in a statewide, multicenter Society of Thoracic Surgeons database.

Methods

Records from 39,812 patients undergoing coronary artery bypass grafting or valve operations (2008-2016) and extubated within 24 hours were stratified according to extubation time between 06:00 and 18:00 (day) or between 18:00 and 6:00 (overnight). Outcomes including reintubation, mortality, and composite morbidity-mortality were evaluated using hierarchical regression models adjusted for Society of Thoracic Surgeons predictive risk scores. To further analyze extubation during the night, a subanalysis stratified patients into 3 groups: 06:00 to 18:00, 18:00 to 24:00, and 24:00 to 06:00.

Results

A total of 20,758 patients were extubated overnight (52.1%) and were slightly older (median age 66 vs 65 years, P < .001) with a longer duration of ventilation (4 vs 7 hours, P < .001). Day and overnight extubation were associated with equivalent operative mortality (1.7% vs 1.7%, P = .880), reintubation (3.7% vs 3.4%, P = .141), and composite morbidity-mortality (8.2% vs 8.0%, P = .314). After risk adjustment, overnight extubation was not associated with any difference in reintubation, mortality, or composite morbidity-mortality. On subanalysis, those extubated between 24:00 and 06:00 exhibited increased composite morbidity-mortality (odds ratio, 1.18; P = .001) but no difference in reintubation or mortality.

Conclusions

Extubation overnight was not associated with increased mortality or reintubation. These results suggest that in the appropriate clinical setting, it is safe to routinely extubate cardiac surgery patients overnight.  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