全文获取类型
收费全文 | 1329950篇 |
免费 | 105043篇 |
国内免费 | 6004篇 |
专业分类
耳鼻咽喉 | 18757篇 |
儿科学 | 44806篇 |
妇产科学 | 35548篇 |
基础医学 | 188407篇 |
口腔科学 | 34577篇 |
临床医学 | 118727篇 |
内科学 | 265460篇 |
皮肤病学 | 28489篇 |
神经病学 | 103003篇 |
特种医学 | 53191篇 |
外国民族医学 | 702篇 |
外科学 | 201363篇 |
综合类 | 37266篇 |
现状与发展 | 20篇 |
一般理论 | 378篇 |
预防医学 | 99124篇 |
眼科学 | 29589篇 |
药学 | 100652篇 |
39篇 | |
中国医学 | 5887篇 |
肿瘤学 | 75012篇 |
出版年
2021年 | 11149篇 |
2019年 | 10931篇 |
2018年 | 15192篇 |
2017年 | 11715篇 |
2016年 | 12604篇 |
2015年 | 15058篇 |
2014年 | 20454篇 |
2013年 | 28915篇 |
2012年 | 40085篇 |
2011年 | 42627篇 |
2010年 | 25436篇 |
2009年 | 24008篇 |
2008年 | 39402篇 |
2007年 | 42018篇 |
2006年 | 42286篇 |
2005年 | 41205篇 |
2004年 | 39391篇 |
2003年 | 38151篇 |
2002年 | 37232篇 |
2001年 | 65090篇 |
2000年 | 67686篇 |
1999年 | 57669篇 |
1998年 | 16006篇 |
1997年 | 14575篇 |
1996年 | 14835篇 |
1995年 | 14051篇 |
1994年 | 13266篇 |
1993年 | 12096篇 |
1992年 | 44908篇 |
1991年 | 43742篇 |
1990年 | 42481篇 |
1989年 | 40332篇 |
1988年 | 37102篇 |
1987年 | 36386篇 |
1986年 | 33746篇 |
1985年 | 32377篇 |
1984年 | 24180篇 |
1983年 | 20303篇 |
1982年 | 11736篇 |
1981年 | 10710篇 |
1979年 | 21355篇 |
1978年 | 14821篇 |
1977年 | 12534篇 |
1976年 | 11693篇 |
1975年 | 12623篇 |
1974年 | 14662篇 |
1973年 | 14119篇 |
1972年 | 12944篇 |
1971年 | 11729篇 |
1970年 | 11050篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
Molnár B. Aroca S. Dobos A. Orbán K. Szabó J. Windisch P. Stähli A. Sculean A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with... 相似文献
2.
目的 了解我国老年人中医证候分布特征,为中医药辨治老年人提供参考依据。方法 系统检索中国知识基础设施(CNKI)、中文科技期刊数据库(CCD)、万方数据资源系统数据库(CSPD),纳入研究对象为老年人的临床流行病学调查研究文献,对其调查目的、调查疾病及调查结果等进行描述统计。结果 ①最终纳入168篇文献,其中2010至2020年之间发表138篇(82.14%);调查地区涵盖全国28个省市自治区,共纳入43948例老年人,累计覆盖340个研究中心;②主要研究结果显示,老年人中医证候阴虚阳亢证(10.05%)>血瘀证(9.5%)>痰浊(湿)证(8.91%)>阴阳两虚证(4.98%)>痰瘀互结证(4.96%);单元证分布阴虚证(14.70%)>痰证(11.22%)>气虚证(7.15%)>肾虚证(4.72%)>血瘀证(4.18%);涉及病变脏腑肾>肝>脾>肺>心。结论 根据统计结果,可以看出老年人证候分布虚证多于实证,虚证中又以阴虚证、气虚证最为多见,实证常见血瘀证、痰浊(湿)证等,且多见痰瘀互结证;老年人五脏皆损,其中又以肾、肝、脾功能失调最为突出。 相似文献
3.
4.
5.
6.
7.
8.
Zongzhang Huang Qigu Yao Jianping Zhu Ying He Yanghao Chen Feng Wu Teng Hua 《Diagnostic and interventional imaging》2021,102(5):279-285
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
9.
10.
Qiangsheng He Chongfei Huang Xiwen Qin Yuanyuan Yu Di Tang Junjie Huang Zi Chong Kuo Yuyao Ling Deli Mao Bin Xia Wenjing Li Kuiqing Lu Man Yang Yulong He Wenbo Meng Jinqiu Yuan Yihang Pan 《International journal of cancer. Journal international du cancer》2023,153(5):942-949
Recent epidemiological studies suggested that proton pump inhibitor (PPI) use was associated with an increased risk of biliary tract cancer (BTC), however, confounders were not adequately controlled. Our study aimed to evaluate PPI use and subsequent risk of BTC and its subtypes in three well-established cohorts. We conducted a pooled analysis of the subjects free of cancers in UK Biobank (n = 463 643), Nurses' Health Study (NHS, n = 80 235) and NHS II (n = 95 869). Propensity score weighted Cox models were used to estimate marginal HRs of PPIs use on BTC risk, accounting for potential confounders. We documented 284 BTC cases in UK Biobank (median follow-up: 7.6 years), and 91 cases in NHS and NHS II cohorts (median follow-up: 15.8 years). In UK biobank, PPI users had a 96% higher risk of BTC compared to nonusers in crude model (HR 1.96, 95% CI 1.44-2.66), but the effect was attenuated to null after adjusting for potential confounders (HR 0.95, 95% CI 0.60-1.49). PPI use was not associated with risk of BTC in the pooled analysis of three cohorts (HR 0.93, 95% CI 0.60-1.43). We also observed no associations between PPI use with risk of intrahepatic (HR 1.00, 95% CI 0.49-2.04), extrahepatic bile duct (HR 1.09, 95% CI 0.52-2.27) and gallbladder cancers (HR 0.66, 95% CI 0.26-1.66) in UK Biobank. In summary, regular use of PPIs was not associated with the risk of BTC and its subtypes. 相似文献