首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   167102篇
  免费   6937篇
  国内免费   369篇
耳鼻咽喉   2223篇
儿科学   4884篇
妇产科学   3860篇
基础医学   24080篇
口腔科学   5610篇
临床医学   9566篇
内科学   36965篇
皮肤病学   4601篇
神经病学   13526篇
特种医学   4046篇
外国民族医学   1篇
外科学   19194篇
综合类   781篇
一般理论   24篇
预防医学   20039篇
眼科学   4463篇
药学   13071篇
中国医学   681篇
肿瘤学   6793篇
  2023年   860篇
  2022年   641篇
  2021年   2628篇
  2020年   1487篇
  2019年   2980篇
  2018年   5094篇
  2017年   3184篇
  2016年   3163篇
  2015年   3515篇
  2014年   3911篇
  2013年   5969篇
  2012年   10395篇
  2011年   11009篇
  2010年   5400篇
  2009年   3952篇
  2008年   8926篇
  2007年   9578篇
  2006年   9172篇
  2005年   8755篇
  2004年   8132篇
  2003年   7609篇
  2002年   7229篇
  2001年   4879篇
  2000年   5459篇
  1999年   4165篇
  1998年   727篇
  1992年   2223篇
  1991年   1989篇
  1990年   1976篇
  1989年   1683篇
  1988年   1605篇
  1987年   1502篇
  1986年   1542篇
  1985年   1453篇
  1984年   1039篇
  1983年   892篇
  1979年   1208篇
  1978年   807篇
  1977年   780篇
  1976年   743篇
  1975年   878篇
  1974年   1120篇
  1973年   1166篇
  1972年   1111篇
  1971年   1078篇
  1970年   1007篇
  1969年   1084篇
  1968年   1105篇
  1967年   977篇
  1966年   880篇
排序方式: 共有10000条查询结果,搜索用时 609 毫秒
31.
32.

Objectives

To determine the incidence of incisional hernia (IH) in the extraction incision (EI) in colorectal resection for cancer. To analyze whether the location of the incision has any relationship with the incidence of hernias and whether mesh could be useful for prevention in high-risk patients.

Methods

Retrospective review of the colon and rectal surgery database from January 2015 to December 2016. Data were classified into 2 groups, transverse (TI) and midline incision (MI), and the latter was divided into 2 subgroups (mesh [MIM] and suture [MIS]). Patients were classified using the HERNIAscore. Hernias were diagnosed by clinical and/or CT examination.

Results

A total of 182 out of 210 surgical patients were included. After a median follow-up of 13.0 months, 39 IH (21.9%) were detected, 23 of which (13.4%) were in the EI; their frequency was lower in the TI group (3.4%) and in the MIM group (5.9%) than in the MIS group (29.5%; p = 0.007). The probability of developing IH in the MIS group showed an OR = 11.7 (95%CI: 3.3-42.0) compared to the TI group and 4.3 (IC 95%: 1.1-16.3) versus the MIM group.

Conclusions

The location of the incision is relevant to avoid incisional hernias. Transverse incisions should be used as the first option. When a midline incision is needed, a prophylactic mesh could be considered in high risk patients because it is safe and associated with low morbidity.  相似文献   
33.
34.
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of...  相似文献   
35.
36.
37.
Background: Most theoretical models of self-determination suggest that both environmental and personal factors influence the development of self-determination. The design and implementation of interventions must be conducted with foreknowledge of such mediating and moderating factors if the intervention is to be successful.

Methods: The purpose of this study was to examine the degree to which several personal factors and school characteristics affect and explain students’ self-determination. A total of 232 students with intellectual disability from Spain participated. Their self-determination level was assessed by the ARC-INICO Scale.

Results: Students with moderate levels of intellectual disability obtained significantly lower scores on self-determination than their peers with mild intellectual disability. There were significant differences in relation to the level of support needs and their experience with transition programs. The level of support needs was a significant predictor.

Conclusion: These findings contribute to current research in this field and practical implications were discussed.  相似文献   

38.
Journal of Digital Imaging - Vertebral Compression Fracture (VCF) occurs when the vertebral body partially collapses under the action of compressive forces. Non-traumatic VCFs can be secondary to...  相似文献   
39.
40.
IntroductionPain is highly prevalent in patients with multiple sclerosis (MS); it is chronic in 50% of cases and is classified as nociceptive, neuropathic, or mixed-type. Pain affects quality of life, sleep, and the activities of daily living. Electrotherapy is an interesting alternative or complementary treatment in the management of pain in MS, with new innovations constantly appearing.Material and methodsThis study evaluates the effectiveness of treatment with monopolar dielectric transmission of pulsed electromagnetic fields (PEMF) for pain associated with MS. We performed a randomised, placebo-controlled clinical trial including 24 patients, who were assessed with the Brief Pain Inventory, the Multiple Sclerosis International Quality of Life questionnaire, the Beck Depression Inventory, and the Modified Fatigue Impact Scale.ResultsStatistically significant improvements were observed in maximum and mean pain scores, as well as in the impact of pain on work, personal relationships, and sleep and rest. Not significant differences were found between the treatment and placebo groups.ConclusionsTreatment with PEMF may be effective in reducing pain in patients with MS, although further research is necessary to confirm its effectiveness over placebo and to differentiate which type of pain may be more susceptible to this treatment.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号