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   2894029篇
  免费   210500篇
  国内免费   15464篇
耳鼻咽喉   38743篇
儿科学   91531篇
妇产科学   79539篇
基础医学   404649篇
口腔科学   78636篇
临床医学   265827篇
内科学   571527篇
皮肤病学   68082篇
神经病学   234071篇
特种医学   110534篇
外国民族医学   833篇
外科学   430967篇
综合类   71670篇
现状与发展   29篇
一般理论   1036篇
预防医学   212010篇
眼科学   65545篇
药学   216007篇
  65篇
中国医学   11651篇
肿瘤学   167041篇
  2021年   26284篇
  2019年   25343篇
  2018年   35200篇
  2017年   27334篇
  2016年   30958篇
  2015年   35937篇
  2014年   49072篇
  2013年   69447篇
  2012年   93064篇
  2011年   98295篇
  2010年   59425篇
  2009年   56121篇
  2008年   89358篇
  2007年   95014篇
  2006年   96358篇
  2005年   92456篇
  2004年   87330篇
  2003年   84069篇
  2002年   80734篇
  2001年   144339篇
  2000年   147725篇
  1999年   124850篇
  1998年   35866篇
  1997年   31779篇
  1996年   31427篇
  1995年   30298篇
  1994年   27677篇
  1993年   25530篇
  1992年   94419篇
  1991年   90249篇
  1990年   87039篇
  1989年   84140篇
  1988年   76965篇
  1987年   75135篇
  1986年   70159篇
  1985年   66645篇
  1984年   49132篇
  1983年   41459篇
  1982年   24163篇
  1981年   21457篇
  1979年   42510篇
  1978年   29596篇
  1977年   25244篇
  1976年   23033篇
  1975年   24640篇
  1974年   28897篇
  1973年   27372篇
  1972年   25754篇
  1971年   23961篇
  1970年   22025篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Immunoglobulin light chain amyloidosis (AL) commonly presents with nephrotic range proteinuria, heart failure with preserved ejection fraction, nondiabetic peripheral neuropathy, unexplained hepatomegaly or diarrhea, and should be considered in patients presenting with these symptoms. More importantly, patients being monitored for smoldering multiple myeloma and a monoclonal gammopathy of undetermined significance (MGUS) are at risk for developing AL amyloidosis. MGUS and myeloma patients that have atypical features, including unexplained weight loss; lower extremity edema, early satiety, and dyspnea on exertion should be considered at risk for light chain amyloidosis. Overlooking the diagnosis of light chain amyloidosis leading to therapy delay is common, and it represents an error of diagnostic consideration. Herein we provide a review of established and investigational treatments for patients with AL amyloidosis and provide algorithms for workup and management of these patients.Subject terms: Myeloma, Chemotherapy  相似文献   
22.
Background:We aim to evaluate the efficiency of Raman spectroscopy (RS) in diagnosing suspected patients with intrahepatic cholangiocarcinoma (ICC), manifested by diagnostic sensitivity, specificity, and accuracy.Methods:We will research widely the articles concerning the use of RS in ICC through authenticated database including PubMed/Medline, EMBASE, Web of Science, Ovid, Web of Knowledge, Cochrane Library, and CNKI between January 2012 and November 2020, retrieving at least 1500 spectra with strict criteria. This study will be carried out in accordance to Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines. We are going to summarize the test performance using random effects models.Results:Based on the pooled sensitivity, specificity, and diagnostic accuracy, we intend to provide the relative diagnostic efficiency in ICC through RS.Conclusion:Through this systematic review and meta-analysis, we intend to provide the pooled sensitivity, specificity and diagnostic accuracy of RS in the diagnosis of suspected ICC. Other parameters like positive likelihood ratios (LR), negative LR, diagnostic odds ratio (DOR), and area under curve (AUC) of the summary receiver operating characteristics (SROC) curve will also be calculated and related figures will be drawn to help illustrate the efficacy of RS in the diagnosis of ICC.  相似文献   
23.
24.
25.
26.
PurposeThe purpose of this study was to make a systematic review and meta-analysis to determine the stent diameter (8 mm vs. 10 mm) that conveys better safety and clinical efficacy for transjugular intrahepatic portosystemic shunt (TIPS).Materials and methodsFour databases were used to identify clinical trials published from inception until March 2020. Data were extracted to estimate and compare one-year and three-year overall survivals, hepatic encephalopathy, variceal rebleeding, and shunt dysfunction rates between patients with 8 mm covered stents and those with 10 mm covered stents.ResultsFive eligible studies were selected, which included 489 patients (316 men, 173 women). The 8 mm covered stent group had higher efficacy regarding one-year or three-year overall survival (odds ratio [OR], 2.88; P = 0.003) and (OR, 1.81; P = 0.04) and lower hepatic encephalopathy (OR, 0.69; P = 0.04) compared with 10 mm covered stent group. There were no significant differences in variceal rebleeding rate (OR 0.80; P = 0.67). However, shunt dysfunction was lower in 10 mm covered stent group (OR, 2.26; P = 0.003).ConclusionsOur results suggest that the use of 8 mm covered stents should be preferred to that of 10 mm covered stents for TIPS placement when portal pressure is frequently monitored.  相似文献   
27.
28.
29.
Abstract

Purpose

Financial hardship can be a major cause of distress among persons with cancer, resulting in chronic stress and impacting physical and emotional health. This paper provides an analysis of the lived experience of cancer patients’ financial hardship from diagnosis to post-treatment.  相似文献   
30.
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