全文获取类型
收费全文 | 163408篇 |
免费 | 31486篇 |
国内免费 | 2507篇 |
专业分类
耳鼻咽喉 | 5312篇 |
儿科学 | 5617篇 |
妇产科学 | 2551篇 |
基础医学 | 5089篇 |
口腔科学 | 1810篇 |
临床医学 | 27746篇 |
内科学 | 49493篇 |
皮肤病学 | 7916篇 |
神经病学 | 15706篇 |
特种医学 | 6915篇 |
外科学 | 42641篇 |
综合类 | 282篇 |
现状与发展 | 72篇 |
一般理论 | 2篇 |
预防医学 | 7550篇 |
眼科学 | 3683篇 |
药学 | 2168篇 |
中国医学 | 193篇 |
肿瘤学 | 12655篇 |
出版年
2024年 | 688篇 |
2023年 | 4856篇 |
2022年 | 1477篇 |
2021年 | 3535篇 |
2020年 | 6242篇 |
2019年 | 2466篇 |
2018年 | 7712篇 |
2017年 | 7604篇 |
2016年 | 8817篇 |
2015年 | 8964篇 |
2014年 | 16118篇 |
2013年 | 16302篇 |
2012年 | 6609篇 |
2011年 | 6492篇 |
2010年 | 10962篇 |
2009年 | 14755篇 |
2008年 | 6479篇 |
2007年 | 4731篇 |
2006年 | 7084篇 |
2005年 | 4301篇 |
2004年 | 3464篇 |
2003年 | 2336篇 |
2002年 | 2397篇 |
2001年 | 4076篇 |
2000年 | 3275篇 |
1999年 | 3403篇 |
1998年 | 3697篇 |
1997年 | 3507篇 |
1996年 | 3386篇 |
1995年 | 3252篇 |
1994年 | 1961篇 |
1993年 | 1574篇 |
1992年 | 1448篇 |
1991年 | 1468篇 |
1990年 | 1132篇 |
1989年 | 1239篇 |
1988年 | 1073篇 |
1987年 | 894篇 |
1986年 | 930篇 |
1985年 | 755篇 |
1984年 | 573篇 |
1983年 | 550篇 |
1982年 | 526篇 |
1981年 | 422篇 |
1980年 | 377篇 |
1979年 | 342篇 |
1978年 | 372篇 |
1977年 | 421篇 |
1975年 | 307篇 |
1972年 | 318篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Interprofessional collaboration and communication in nursing homes: a qualitative exploration of problems in medical care for nursing home residents – study protocol 下载免费PDF全文
5.
Lois Isaksen MD 《Academic emergency medicine》2015,22(9):1125-1126
6.
Ho-Chul Jung Sung-Bin Chon Won Sup Oh Dong-Hyun Lee Ho-Jin Lee 《The American journal of tropical medicine and hygiene》2015,92(2):256-261
Scrub typhus usually presents as acute undifferentiated fever. This cross-sectional study included adult patients presenting with acute undifferentiated fever defined as any febrile illness for ≤ 14 days without evidence of localized infection. Scrub typhus cases were defined by an antibody titer of a ≥ fourfold increase in paired sera, a ≥ 1:160 in a single serum using indirect immunofluorescence assay, or a positive result of the immunochromatographic test. Multiple regression analysis identified predictors associated with scrub typhus to develop a prediction rule. Of 250 cases with known etiology of acute undifferentiated fever, influenza (28.0%), hepatitis A (25.2%), and scrub typhus (16.4%) were major causes. A prediction rule for identifying suspected cases of scrub typhus consisted of age ≥ 65 years (two points), recent fieldwork/outdoor activities (one point), onset of illness during an outbreak period (two points), myalgia (one point), and eschar (two points). The c statistic was 0.977 (95% confidence interval = 0.960–0.994). At a cutoff value ≥ 4, the sensitivity and specificity were 92.7% (79.0–98.1%) and 90.9% (86.0–94.3%), respectively. Scrub typhus, the third leading cause of acute undifferentiated fever in our region, can be identified early using the prediction rule. 相似文献
7.
This retrospective study aimed to evaluate radiation-induced pneumonitis (RIP) and a related condition that we define in this report—prolonged minimal RIP (pmRIP)—after stereotactic body radiotherapy (SBRT) for Stage I primary lung cancer in patients with chronic obstructive pulmonary disease (COPD). We assessed 136 Stage I lung cancer patients with COPD who underwent SBRT. Airflow limitation on spirometry was classified into four Global Initiative for Chronic Obstructive Lung Disease (GOLD) grades, with minor modifications: GOLD 1 (mild), GOLD 2 (moderate), GOLD 3 (severe) and GOLD 4 (very severe). On this basis, we defined two subgroups: COPD-free (COPD −) and COPD-positive (COPD +). There was no significant difference in overall survival or cause-specific–survival between these groups. Of the 136 patients, 44 (32%) had pmRIP. Multivariate analysis showed that COPD and the Brinkman index were statistically significant risk factors for the development of pmRIP. COPD and the Brinkman index were predictive factors for pmRIP, although our findings also indicate that SBRT can be tolerated in early lung cancer patients with COPD. 相似文献
8.
9.
10.