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   22486篇
  免费   1519篇
  国内免费   95篇
耳鼻咽喉   197篇
儿科学   577篇
妇产科学   562篇
基础医学   3564篇
口腔科学   754篇
临床医学   1950篇
内科学   4990篇
皮肤病学   482篇
神经病学   2314篇
特种医学   762篇
外国民族医学   1篇
外科学   2589篇
综合类   78篇
一般理论   8篇
预防医学   1236篇
眼科学   423篇
药学   1739篇
中国医学   66篇
肿瘤学   1808篇
  2023年   164篇
  2022年   340篇
  2021年   659篇
  2020年   413篇
  2019年   546篇
  2018年   667篇
  2017年   537篇
  2016年   632篇
  2015年   795篇
  2014年   899篇
  2013年   1134篇
  2012年   1764篇
  2011年   1884篇
  2010年   943篇
  2009年   919篇
  2008年   1466篇
  2007年   1407篇
  2006年   1312篇
  2005年   1221篇
  2004年   1074篇
  2003年   1004篇
  2002年   864篇
  2001年   257篇
  2000年   266篇
  1999年   267篇
  1998年   184篇
  1997年   174篇
  1996年   120篇
  1995年   117篇
  1994年   95篇
  1993年   81篇
  1992年   127篇
  1991年   125篇
  1990年   117篇
  1989年   146篇
  1988年   84篇
  1987年   92篇
  1986年   90篇
  1985年   75篇
  1984年   63篇
  1983年   56篇
  1982年   51篇
  1981年   46篇
  1980年   37篇
  1979年   82篇
  1978年   43篇
  1974年   52篇
  1973年   46篇
  1972年   48篇
  1971年   49篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
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   

2.

Objective

Comparative survival between neoadjuvant chemotherapy and adjuvant chemotherapy for patients with cT2-4N0-1M0 non–small cell lung cancer has not been extensively studied.

Methods

Patients with cT2-4N0-1M0 non–small cell lung cancer who received platinum-based chemotherapy were retrospectively identified. Exclusion criteria included stage IV disease, induction radiotherapy, and targeted therapy. The primary end point was disease-free survival. Secondary end points were overall survival, chemotherapy tolerance, and ability of Response Evaluation Criteria In Solid Tumors response to predict survival. Survival was estimated using the Kaplan–Meier method, compared using the log-rank test and Cox proportional hazards models, and stratified using matched pairs after propensity score matching.

Results

In total, 330 patients met the inclusion criteria (n = 92/group after propensity-score matching; median follow-up, 42 months). Five-year disease-free survival was 49% (95% confidence interval, 39-61) for neoadjuvant chemotherapy versus 48% (95% confidence interval, 38-61) for adjuvant chemotherapy (P = .70). On multivariable analysis, disease-free survival was not associated with neoadjuvant chemotherapy or adjuvant chemotherapy (hazard ratio, 1.1; 95% confidence interval, 0.64-1.90; P = .737), nor was overall survival (hazard ratio, 1.21; 95% confidence interval, 0.63-2.30; P = .572). The neoadjuvant chemotherapy group was more likely to receive full doses and cycles of chemotherapy (P = .014/0.005) and had fewer grade 3 or greater toxicities (P = .001). Response Evaluation Criteria In Solid Tumors response to neoadjuvant chemotherapy was associated with disease-free survival (P = .035); 15% of patients receiving neoadjuvant chemotherapy (14/92) had a major pathologic response.

Conclusions

Timing of chemotherapy, before or after surgery, is not associated with an improvement in overall or disease-free survival among patients with cT2-4N0-1M0 non–small cell lung cancer who undergo complete surgical resection.  相似文献   
3.
ABSTRACT

Introduction

Glucocorticoid (GC) induced osteoporosis (GIOP) is the most common form of secondary osteoporosis. It develops in a dose and time dependent manner, due to a rapid and transient increase in bone resorption, followed by the inhibition of bone formation.  相似文献   
4.
5.
6.
7.
8.
9.
10.
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