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   21753篇
  免费   1404篇
  国内免费   78篇
耳鼻咽喉   211篇
儿科学   588篇
妇产科学   589篇
基础医学   3395篇
口腔科学   825篇
临床医学   1824篇
内科学   4765篇
皮肤病学   403篇
神经病学   2684篇
特种医学   684篇
外国民族医学   1篇
外科学   2205篇
综合类   116篇
一般理论   8篇
预防医学   1282篇
眼科学   342篇
药学   1527篇
中国医学   58篇
肿瘤学   1728篇
  2023年   166篇
  2022年   322篇
  2021年   664篇
  2020年   398篇
  2019年   540篇
  2018年   665篇
  2017年   523篇
  2016年   614篇
  2015年   737篇
  2014年   857篇
  2013年   1103篇
  2012年   1685篇
  2011年   1776篇
  2010年   929篇
  2009年   856篇
  2008年   1374篇
  2007年   1287篇
  2006年   1198篇
  2005年   1135篇
  2004年   995篇
  2003年   944篇
  2002年   820篇
  2001年   223篇
  2000年   227篇
  1999年   213篇
  1998年   162篇
  1997年   140篇
  1996年   114篇
  1995年   96篇
  1994年   70篇
  1993年   72篇
  1992年   151篇
  1991年   156篇
  1990年   126篇
  1989年   141篇
  1988年   99篇
  1987年   127篇
  1986年   105篇
  1985年   104篇
  1984年   78篇
  1983年   76篇
  1982年   74篇
  1981年   59篇
  1979年   67篇
  1978年   51篇
  1977年   57篇
  1975年   68篇
  1974年   44篇
  1973年   55篇
  1972年   50篇
排序方式: 共有10000条查询结果,搜索用时 15 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