全文获取类型
收费全文 | 33229篇 |
免费 | 2513篇 |
国内免费 | 465篇 |
专业分类
耳鼻咽喉 | 689篇 |
儿科学 | 561篇 |
妇产科学 | 697篇 |
基础医学 | 4616篇 |
口腔科学 | 514篇 |
临床医学 | 2720篇 |
内科学 | 7430篇 |
皮肤病学 | 970篇 |
神经病学 | 2393篇 |
特种医学 | 1733篇 |
外科学 | 4600篇 |
综合类 | 553篇 |
现状与发展 | 1篇 |
一般理论 | 19篇 |
预防医学 | 1408篇 |
眼科学 | 1003篇 |
药学 | 2879篇 |
中国医学 | 370篇 |
肿瘤学 | 3051篇 |
出版年
2023年 | 198篇 |
2022年 | 138篇 |
2021年 | 913篇 |
2020年 | 561篇 |
2019年 | 898篇 |
2018年 | 1063篇 |
2017年 | 756篇 |
2016年 | 961篇 |
2015年 | 1329篇 |
2014年 | 1563篇 |
2013年 | 1800篇 |
2012年 | 2610篇 |
2011年 | 2705篇 |
2010年 | 1632篇 |
2009年 | 1398篇 |
2008年 | 1995篇 |
2007年 | 1918篇 |
2006年 | 1722篇 |
2005年 | 1653篇 |
2004年 | 1375篇 |
2003年 | 1347篇 |
2002年 | 1200篇 |
2001年 | 768篇 |
2000年 | 699篇 |
1999年 | 654篇 |
1998年 | 233篇 |
1997年 | 216篇 |
1996年 | 189篇 |
1995年 | 189篇 |
1994年 | 162篇 |
1993年 | 106篇 |
1992年 | 329篇 |
1991年 | 238篇 |
1990年 | 278篇 |
1989年 | 265篇 |
1988年 | 253篇 |
1987年 | 213篇 |
1986年 | 195篇 |
1985年 | 172篇 |
1984年 | 148篇 |
1983年 | 120篇 |
1982年 | 86篇 |
1981年 | 80篇 |
1980年 | 77篇 |
1979年 | 134篇 |
1978年 | 91篇 |
1977年 | 71篇 |
1975年 | 63篇 |
1974年 | 56篇 |
1972年 | 53篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
Suk Ho Sohn Kyung Hwan Kim Yeiwon Lee Jae Woong Choi Ho Young Hwang 《The Journal of thoracic and cardiovascular surgery》2021,161(5):1788-1798.e5
ObjectiveThis study was conducted to compare the outcomes of rigid ring versus De Vega annuloplasty for the treatment of functional tricuspid regurgitation (TR).MethodsFrom 2003 to 2017, De Vega annuloplasty (group D) was used in 231 patients, and rigid ring annuloplasty (group R) was used in 204 patients for the treatment of functional TR during left-sided valve surgery. A propensity score-matching analysis was used to pair group D (n = 109) with group R (n = 109). The primary outcomes were long-term overall survival and cardiac death, and the secondary outcomes were tricuspid valve-related events and TR recurrence (TR moderate or severe). The follow-up data were complete in 99.6% (447 out of 449) of the patients with a follow-up duration of 102 months.ResultsThere were no differences in the overall survival and cardiac death between the propensity score-matched groups (P = .793 and P = .175, respectively) up to 14 years after surgery. Tricuspid valve-related events, including cardiac death, permanent pacemaker implantation, thromboembolism, bleeding and tricuspid valve reoperation were also similar between the 2 matched groups during the follow-up (P > .999). However, cumulative incidence of TR recurrence was significantly higher in group R than in group D (P = .007). Multivariate analysis indicated the annuloplasty method (De Vega) and preoperative TR grade as risk factors for late TR recurrence.ConclusionsIn functional TR, annuloplasty methods did not influence long-term overall survival, cardiac mortality, and tricuspid valve-related events. However, rigid ring annuloplasty showed less late TR recurrence. Rigid ring annuloplasty can be considered for the treatment of functional TR in terms of its better durability. 相似文献
22.
The cingulum, connecting the orbitofrontal cortex to the medial temporal lobe, involves in diverse cognition functions including attention, memory, and motivation. To investigate the relationship between the cingulum injury and cognitive impairment in patients with chronic mild traumatic brain injury, we evaluated the integrity between the anterior cingulum and the basal forebrain using diffusion tensor tractography in 73 patients with chronic mild traumatic brain injury(39 males, 34 females, age 43.29 ± 11.42 years) and40 healthy controls(22 males, 18 females, age 40.11 ± 16.81 years). The patients were divided into three subgroups based on the integrity between the anterior cingulum and the basal forebrain on diffusion tensor tractography: subgroup A(n = 19 patients)-both sides of the anterior cingulum were intact; subgroup B(n= 36 patients)-either side of the anterior cingulum was intact; and subgroup C(18 patients)-both sides of the anterior cingulum were discontinued. There were significant differences in total Memory Assessment Scale score between subgroups A and B and between subgroups A and C. There were no significant differences in diffusion tensor tractography parameters(fractional anisotropy, apparent diffusion coefficient, and fiber volume) between patients and controls. These findings suggest that the integrity between the anterior cingulum and the basal forebrain, but not diffusion tensor tractography parameter, can be used to predict the cognitive function of patients with chronic mild traumatic brain injury. This study was approved by Yeungnam University Hospital Institutional Review Board(approval No. YUMC-2014-01-425-010) on August 16, 2017. 相似文献
23.
24.
25.
26.
27.
28.
29.
30.
Won Kyung Cho Won Park Doo Ho Choi Yong Bae Kim Jin Ho Kim Su Ssan Kim Kyubo Kim Jin Hee Kim Sung Ja Ahn Sun Young Lee Jeongshim Lee Sang-Won Kim Jeanny Kwon Ki Jung Ahn 《Clinical breast cancer》2019,19(1):78-86