全文获取类型
收费全文 | 206275篇 |
免费 | 3204篇 |
国内免费 | 55篇 |
专业分类
耳鼻咽喉 | 1418篇 |
儿科学 | 7758篇 |
妇产科学 | 3942篇 |
基础医学 | 20526篇 |
口腔科学 | 1952篇 |
临床医学 | 16529篇 |
内科学 | 36203篇 |
皮肤病学 | 1118篇 |
神经病学 | 19719篇 |
特种医学 | 9472篇 |
外国民族医学 | 4篇 |
外科学 | 31514篇 |
综合类 | 2634篇 |
一般理论 | 45篇 |
预防医学 | 22404篇 |
眼科学 | 3219篇 |
药学 | 11529篇 |
中国医学 | 646篇 |
肿瘤学 | 18902篇 |
出版年
2024年 | 45篇 |
2023年 | 293篇 |
2022年 | 518篇 |
2021年 | 1120篇 |
2020年 | 681篇 |
2019年 | 1046篇 |
2018年 | 22902篇 |
2017年 | 18049篇 |
2016年 | 20341篇 |
2015年 | 1881篇 |
2014年 | 2080篇 |
2013年 | 2578篇 |
2012年 | 9565篇 |
2011年 | 23719篇 |
2010年 | 20146篇 |
2009年 | 12693篇 |
2008年 | 21659篇 |
2007年 | 23846篇 |
2006年 | 2616篇 |
2005年 | 4107篇 |
2004年 | 5099篇 |
2003年 | 5818篇 |
2002年 | 3998篇 |
2001年 | 460篇 |
2000年 | 562篇 |
1999年 | 353篇 |
1998年 | 497篇 |
1997年 | 431篇 |
1996年 | 253篇 |
1995年 | 272篇 |
1994年 | 225篇 |
1993年 | 176篇 |
1992年 | 106篇 |
1991年 | 129篇 |
1990年 | 172篇 |
1989年 | 118篇 |
1988年 | 98篇 |
1987年 | 78篇 |
1986年 | 61篇 |
1985年 | 48篇 |
1984年 | 39篇 |
1983年 | 50篇 |
1982年 | 50篇 |
1980年 | 52篇 |
1938年 | 60篇 |
1937年 | 25篇 |
1935年 | 22篇 |
1934年 | 31篇 |
1932年 | 56篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
21.
Sergio Barroilhet Adrián Cano-Prous Salvador Cervera-Enguix Maria João Forjaz Francisco Guillén-Grima 《Social psychiatry and psychiatric epidemiology》2009,44(12):1051-1065
Introduction
This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning. 相似文献22.
23.
Seena Fazel Johanna Philipson Lisa Gardiner Rowena Merritt Martin Grann 《Journal of neurology》2009,256(10):1591-1602
The objectives of this study were to systematically review and meta-analyze the research literature on the association of common neurological disorders and violence. Keywords relating to neurological disorders and violence were searched between 1966 and August 2008. Case–control and cohort studies were selected. Odds ratios of violence risk in particular disorders compared with controls were combined using fixed-effects meta-analysis with the data presented in forest plots. Sensitivity analyses were conducted to identify possible differences in risk estimates across surveys. Information on risk factors for violence was extracted if replicated in more than one study. Nine studies were identified that compared the risk of violence in epilepsy or traumatic brain injury compared with unaffected controls. For the epilepsy studies, the overall pooled odds ratio for violent outcomes was 0.67 [95% confidence interval (CI) 0.46–0.96]. For traumatic brain injury, the odds ratio was 1.66 (95% CI 1.12–2.31). An additional 11 case–control studies investigated factors associated with violence in epilepsy and traumatic brain injury. It was not possible to meta-analyze these data. Comorbid psychopathology was associated with violence. Data on other neurological conditions was limited and unreplicated. In conclusion, although the evidence was limited and methodological quality varied, epilepsy and traumatic brain injury appeared to differ in their risk of violence compared with control populations. Longitudinal studies are required to replicate this review’s provisional findings that epilepsy is inversely associated with violence and that brain injury modestly increases the risk, and further research is needed to provide information on a broader range of risk factors. 相似文献
24.
25.
26.
27.
28.
Introduction
Although ependymoma is the third most common pediatric brain tumor, we know little about the genetic/epigenetic basis of its initiation, maintenance, or progression. This is due in part to the heterogeneity of the disease, as well as the small sample size of the cohorts analyzed in most studies. 相似文献29.
Peter Angelos 《World journal of surgery》2009,33(4):609-611
30.
Kentaroh Miyoshi Minoru Naito Tsuyoshi Ueno Shinji Hato Hideo Ino 《General thoracic and cardiovascular surgery》2009,57(11):629-632
A benign esophageal leiomyoma with abnormally increased fluorine-18-fluorodeoxyglucose uptake on positron emission tomography
(PET) was resected thoracoscopically. The tumor, of which the maximum standardized uptake value of the lesion was 4.7, was
well defined and 38 mm in diameter. Neither mitotic activity nor degeneration was found histologically; and immunoreactivity
for CD34, CD117, MIB-1, and glucose transporter-1 was negative immunohistochemically. A diagnosis of gastrointestinal stromal
tumor was ruled out by an oncogenic kinase gene mutation study. This case cautions against PET-dependent evaluation for malignant
potential of esophageal submucosal tumors. 相似文献