全文获取类型
收费全文 | 260191篇 |
免费 | 25212篇 |
国内免费 | 17605篇 |
专业分类
耳鼻咽喉 | 2316篇 |
儿科学 | 2874篇 |
妇产科学 | 3319篇 |
基础医学 | 28769篇 |
口腔科学 | 4453篇 |
临床医学 | 35548篇 |
内科学 | 35738篇 |
皮肤病学 | 2616篇 |
神经病学 | 13061篇 |
特种医学 | 9683篇 |
外国民族医学 | 138篇 |
外科学 | 25079篇 |
综合类 | 47425篇 |
现状与发展 | 65篇 |
一般理论 | 19篇 |
预防医学 | 17701篇 |
眼科学 | 7304篇 |
药学 | 28074篇 |
256篇 | |
中国医学 | 17595篇 |
肿瘤学 | 20975篇 |
出版年
2024年 | 729篇 |
2023年 | 3771篇 |
2022年 | 9259篇 |
2021年 | 13322篇 |
2020年 | 10127篇 |
2019年 | 8366篇 |
2018年 | 8874篇 |
2017年 | 8281篇 |
2016年 | 7534篇 |
2015年 | 12032篇 |
2014年 | 14819篇 |
2013年 | 13600篇 |
2012年 | 20187篇 |
2011年 | 22321篇 |
2010年 | 14462篇 |
2009年 | 11656篇 |
2008年 | 14509篇 |
2007年 | 14350篇 |
2006年 | 13997篇 |
2005年 | 13433篇 |
2004年 | 8549篇 |
2003年 | 7833篇 |
2002年 | 6419篇 |
2001年 | 5752篇 |
2000年 | 5961篇 |
1999年 | 5902篇 |
1998年 | 3559篇 |
1997年 | 3530篇 |
1996年 | 2860篇 |
1995年 | 2643篇 |
1994年 | 2169篇 |
1993年 | 1391篇 |
1992年 | 1901篇 |
1991年 | 1606篇 |
1990年 | 1300篇 |
1989年 | 1093篇 |
1988年 | 1021篇 |
1987年 | 863篇 |
1986年 | 722篇 |
1985年 | 534篇 |
1984年 | 338篇 |
1983年 | 246篇 |
1982年 | 154篇 |
1981年 | 145篇 |
1980年 | 112篇 |
1979年 | 142篇 |
1978年 | 49篇 |
1977年 | 54篇 |
1975年 | 57篇 |
1974年 | 56篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
目的 运用网状Meta分析方法评价针灸联合关节松动术治疗肩周炎的疗效。方法 运用计算机检索Web of Science、PubMed、Cochrane Library、EMbase、维普(VIP)、中国知网(CNKI)、万方(Wanfang)、中国生物医学文献数据库(CBM),搜寻有关针灸联合关节松动术治疗肩周炎的随机对照试验。所有研究人员均独立纳排文献、提录资料、风险评估,对符合质量标准的RCT研究采用Stata16.0和Review Manager 5.4软件进行分析。结果 共检索出6561篇文献,最终纳入37项研究,涉及10种针灸联合关节松动术方法。总样本量2890例,其中试验组1432例,对照组1458例。网状Meta分析所得结果表明:①在总有效率方面,最好的3种治疗方法为内热针联合组、温针联合组、动筋针联合组;②在降低VAS评分方面,最好的3种治疗方法为内热针联合组、动筋针联合组、针刀联合组。结论 针灸联合关节松动术治疗肩周炎疗效总体优于单独使用,且内热针联合组具有最佳的疗效。 相似文献
92.
Mayuko Kinoshita Haruka Kaneko Lizu Liu Masashi Nagao Ryo Sadatsuki 《Modern rheumatology / the Japan Rheumatism Association》2019,29(1):157-164
Objectives: To examine the factors associated with increase in lumbar spine bone mineral density (LS-BMD) by bisphosphonates (BPs) with active vitamin D analog (aVD).Methods: Two independent postmenopausal osteoporotic patients treated by BPs with aVD for 24 months (Study 1: n?=?93, Study 2: n?=?99) were retrospectively analyzed.Results: In Study 1, LS-BMD of the patients significantly increased for 24 m (5.4%, p?.001). A multiple regression analysis among baseline characteristics revealed that serum calcium (sCa: 8.5–10.5?mg/dL) was associated with an increased LS-BMD by treatment (r2: 0.088, p?=?.02). While average sCa of the patients was 9.2?mg/dL before treatment, it increased time-dependently to 9.6?mg/dL for 24 m by treatment. As each patient had their LS-BMD five times during the study, there were four instances of %LS-BMD in each patient, resulting in 372 instances of %LS-BMD in Study 1. The smallest Akaike’s information criterion value for the most appropriate cut-off levels of sCa for %LS-BMD by treatment every 6 m was 9.3?mg/dL. The %LS-BMD by treatment for 6 m during 24 m period in patients with sCa ≥9.3?mg/dL (1.5%) was significantly higher than that in patients with sCa <9.3?mg/dL (0.8%, p?=?.038). The results of Study 2 were similar to those of Study 1, confirming the phenomena observed.Conclusion: sCa was associated with an increased LS-BMD by BPs with aVD. 相似文献
93.
94.
Chien-Hua Tseng Ben-Jei Tsuang Chun-Ju Chiang Kai-Chen Ku Jeng-Sen Tseng Tsung-Ying Yang Kuo-Hsuan Hsu Kun-Chieh Chen Sung-Liang Yu Wen-Chung Lee Tsang-Wu Liu Chang-Chuan Chan Gee-Chen Chang 《Journal of thoracic oncology》2019,14(5):784-792
Introduction
For never-smokers (smoked <100 lifetime cigarettes), lung cancer (LC) has emerged as an important issue. We aimed to investigate the effects of prevalence changes in tobacco smoking and particulate matter (PM) 2.5 (PM2.5) levels on LC in Taiwan, in relation to contrasting PM2.5 levels, between Northern Taiwan (NT) and Southern Taiwan (ST).Methods
We reviewed 371,084 patients with LC to assess smoking prevalence and correlations between the incidence of adenocarcinoma lung cancer (AdLC) and non-AdLC. Two subsets were selected to assess different AdLC stage trends and the effect of PM2.5 on survival of patients with AdLC.Results
From 1995 to 2015, the proportion of male adult ever-smokers decreased from 59.4% to 29.9% whereas the female smoking rate remained low (3.2% to 5.3%). AdLC incidence in males and females increased from 9.06 to 23.25 and 7.05 to 24.22 per 100,000 population, respectively. Since 1993, atmospheric visibility in NT improved (from 7.6 to 11.5 km), but deteriorated in ST (from 16.3 to 4.2 km). The annual percent change in AdLC stages IB to IV was 0.3% since 2009 (95% confidence interval [CI]: -1.9%–2.6%) in NT, and 4.6% since 2007 (95% CI: 3.3%–5.8%) in ST; 53% patients with LC had never smoked. Five-year survival rates for never-smokers, those with EGFR wild-type genes, and female patients with AdLC were 12.6% in NT and 4.5% in ST (hazard ratio: 0.79, 95% CI: 0.70–0.90).Conclusions
In Taiwan, greater than 50% of patients with LC had never smoked. PM2.5 level changes can affect AdLC incidence and patient survival. 相似文献95.
96.
97.
Yuanqing Yao Jun Qian Shunkang Rong Yuwen Huang Bo Xiong Gang Yang Dengqing Zhang Shimin Deng Jie Tan Que Zhu Changming Deng Dichuan Liu Haitao Ran Zhigang Wang Jing Huang 《Ultrasound in medicine & biology》2019,45(2):490-499
Stellate ganglion (SG) modification has been investigated for arrhythmia treatment. In this study, transesophageal SG imaging and intervention were explored using a homemade 30F integrated focused ultrasonic catheter in healthy mongrel canines in vivo. Anatomic details of SGs were ultrasonically imaged and evaluated. SG had a heterogeneous echoic structure and characteristic profiles sketched by hyper-echoic outlines in an ultrasonogram. Left SGs in the experimental group were successfully ablated through the esophagus under ultrasonic guidance provided by the catheter itself. Two weeks after the ablation, the QT and QTc of the experimental group decreased compared with those of the sham group and at baseline (both p values < 0.001). Histologic examination revealed that left SGs were destroyed. No major complications were observed. This approach may be further explored as a method for ganglia remodeling evaluation and as a strategy of ganglia modification for arrhythmia and for other diseases. 相似文献
98.
Micro‐evolution of the hepatitis B virus genome in hepatitis B e‐antigen‐positive carriers: Comparison of genotypes B and C at various immune stages 下载免费PDF全文
99.
100.
目的了解北京市小汤山地区儿童贫血分布情况,并指出合理化预防措施。方法采用日本产西斯美康xs-800i全血细胞分析仪,检测0-3岁儿童末梢血的血红蛋白含量。结果 2013年儿保门诊0~3岁儿童体检人数为1334人,其中贫血患儿为176名,贫血的发病率是13.19%。其中,本地儿童616人,贫血发病率是9.42%;流动儿童718人,贫血发病率是16.43%,二者间有统计学差异(P0.01);男性儿童贫血发病率为13.02%,女性贫血发病率13.46%,二者间无统计学差异(P0.01);6个月-1岁儿童贫血发病率为35.79%,1-2岁为4.48%,2-3岁为2.61%,三组间有统计学差异(P0.01),纯母乳喂养儿童贫血人数为47人,贫血的发病率是6.15%,混合喂养儿童贫血人数为29人,贫血的发病率是8.19%,人工喂养喂养儿童贫血人数为100人,贫血的发病率是46.30%,三者差异存在统计学意义(P0.01);母孕期贫血儿童贫血人数为97人,贫血的发病率是18.29%,母孕期无贫血儿童贫血人数为79人,贫血的发病率是10.75%,三者差异存在统计学意义(P0.01)。结论本地区0~3岁儿童贫血患病比6个月-1岁儿童显著增高,流动儿童比本市儿童贫血患病率显著增高,此外母孕期贫血及婴儿喂养方式的不同也是影响儿童贫血的原因,加强流动儿童管理,正确指导6个月后婴儿家长的喂养方法及加强预产妇孕期营养指导应成为今后工作的重点。 相似文献