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   216788篇
  免费   9974篇
  国内免费   562篇
耳鼻咽喉   2819篇
儿科学   6218篇
妇产科学   5307篇
基础医学   30853篇
口腔科学   6628篇
临床医学   13767篇
内科学   48757篇
皮肤病学   5705篇
神经病学   18148篇
特种医学   5976篇
外国民族医学   9篇
外科学   25847篇
综合类   1130篇
一般理论   43篇
预防医学   24128篇
眼科学   5188篇
药学   16234篇
中国医学   828篇
肿瘤学   9739篇
  2023年   1078篇
  2022年   1278篇
  2021年   4173篇
  2020年   2270篇
  2019年   4178篇
  2018年   7844篇
  2017年   4854篇
  2016年   4266篇
  2015年   4610篇
  2014年   5619篇
  2013年   8108篇
  2012年   13093篇
  2011年   13798篇
  2010年   7281篇
  2009年   5725篇
  2008年   11367篇
  2007年   11988篇
  2006年   11349篇
  2005年   11025篇
  2004年   10291篇
  2003年   9634篇
  2002年   9136篇
  2001年   6235篇
  2000年   6900篇
  1999年   5352篇
  1998年   1274篇
  1992年   2878篇
  1991年   2562篇
  1990年   2557篇
  1989年   2215篇
  1988年   2095篇
  1987年   1962篇
  1986年   1968篇
  1985年   1784篇
  1984年   1310篇
  1983年   1093篇
  1979年   1413篇
  1978年   951篇
  1977年   935篇
  1976年   894篇
  1975年   1024篇
  1974年   1274篇
  1973年   1320篇
  1972年   1239篇
  1971年   1219篇
  1970年   1123篇
  1969年   1183篇
  1968年   1216篇
  1967年   1089篇
  1966年   952篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
41.

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   
42.
43.
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   
44.
45.
46.
47.
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   

48.
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   
49.
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   
50.
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