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   26684篇
  免费   1944篇
  国内免费   77篇
耳鼻咽喉   399篇
儿科学   745篇
妇产科学   561篇
基础医学   3767篇
口腔科学   282篇
临床医学   2647篇
内科学   5491篇
皮肤病学   537篇
神经病学   2632篇
特种医学   1212篇
外科学   4374篇
综合类   259篇
一般理论   23篇
预防医学   1819篇
眼科学   452篇
药学   1771篇
中国医学   28篇
肿瘤学   1706篇
  2023年   297篇
  2022年   557篇
  2021年   1134篇
  2020年   640篇
  2019年   964篇
  2018年   1087篇
  2017年   742篇
  2016年   764篇
  2015年   950篇
  2014年   1196篇
  2013年   1505篇
  2012年   2185篇
  2011年   2221篇
  2010年   1190篇
  2009年   942篇
  2008年   1462篇
  2007年   1478篇
  2006年   1395篇
  2005年   1211篇
  2004年   1086篇
  2003年   928篇
  2002年   826篇
  2001年   287篇
  2000年   211篇
  1999年   229篇
  1998年   159篇
  1997年   118篇
  1996年   119篇
  1995年   87篇
  1994年   69篇
  1993年   67篇
  1992年   132篇
  1991年   123篇
  1990年   110篇
  1989年   128篇
  1988年   90篇
  1987年   104篇
  1986年   102篇
  1985年   88篇
  1984年   78篇
  1983年   64篇
  1982年   64篇
  1981年   66篇
  1980年   51篇
  1979年   65篇
  1978年   54篇
  1974年   52篇
  1973年   64篇
  1972年   62篇
  1940年   48篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Neurosurgical Review - Aneurysmal subarachnoid hemorrhage (aSAH) is an emergent condition requiring rapid intervention and prolonged monitoring. There are few recommendations regarding the...  相似文献   
72.
The first national medical database registry was started in Sweden in 1975, and clinical registries have gained enormous popularity. Analysis of a large database of rotator cuff repair surgeries shows that adverse events may occur in almost 1 of 5 cases, showing the use of a register as a highly beneficial source of information. However, retrospective review of prospectively collected registry data has limitations and biases as well as benefits, including inconsistent reporting and recording of data, lack of control of confounding patient variables, and loss to follow-up.  相似文献   
73.
High-risk combinations of recipient and graft characteristics are poorly defined for liver retransplantation (reLT) in the current era. We aimed to develop a risk model for survival after reLT using data from the European Liver Transplantation Registry, followed by internal and external validation. From 2006 to 2016, 85 067 liver transplants were recorded, including 5581 reLTs (6.6%). The final model included seven predictors of graft survival: recipient age, model for end-stage liver disease score, indication for reLT, recipient hospitalization, time between primary liver transplantation and reLT, donor age, and cold ischemia time. By assigning points to each variable in proportion to their hazard ratio, a simplified risk score was created ranging 0–10. Low-risk (0–3), medium-risk (4–5), and high-risk (6–10) groups were identified with significantly different 5-year survival rates ranging 56.9% (95% CI 52.8–60.7%), 46.3% (95% CI 41.1–51.4%), and 32.1% (95% CI 23.5–41.0%), respectively (< 0.001). External validation showed that the expected survival rates were closely aligned with the observed mortality probabilities. The Retransplantation Risk Score identifies high-risk combinations of recipient- and graft-related factors prognostic for long-term graft survival after reLT. This tool may serve as a guidance for clinical decision-making on liver acceptance for reLT.  相似文献   
74.
BackgroundPancreatoduodenectomies at high risk for clinically relevant pancreatic fistula are uncommon, yet intimidating, situations. In such scenarios, the impact of individual surgeon experience on outcomes is poorly understood.MethodsThe fistula risk score was applied to identify high-risk patients (fistula risk score 7–10) from 7,706 pancreatoduodenectomies performed at 18 international institutions (2003–2020). For each case, surgeon pancreatoduodenectomy career volume and years of practice were linked to intraoperative fistula mitigation strategy adoption and outcomes. Consequently, best operative approaches for clinically relevant pancreatic fistula prevention and best performer profiles were identified through multivariable analysis models.ResultsEight hundred and thirty high-risk pancreatoduodenectomies, performed by 64 surgeons, displayed an overall clinically relevant pancreatic fistula rate of 33.7%. Clinically relevant pancreatic fistula rates decreased with escalating surgeon career pancreatoduodenectomy (–49.7%) and career length (–41.2%; both P < .001), as did transfusion and reoperation rates, postoperative morbidity index, and duration of stay. Great experience (≥400 pancreatoduodenectomies performed or ≥21-year-long career) was a significant predictor of clinically relevant pancreatic fistula prevention (odds ratio 0.52, 95% confidence interval 0.35–0.76) and was more often associated with pancreatojejunostomy reconstruction and prophylactic octreotide omission, which were both independently associated with clinically relevant pancreatic fistula reduction. A risk-adjusted performance analysis also correlated with experience. Moreover, minimizing blood loss (≤400 mL) significantly contributed to clinically relevant pancreatic fistula prevention (odds ratio 0.40, 95% confidence interval 0.22–0.74).ConclusionSurgeon experience is a key contributor to achieve better outcomes after high-risk pancreatoduodenectomy. Surgeons can improve their performance in these challenging situations by employing pancreatojejunostomy reconstruction, omitting prophylactic octreotide, and minimizing blood loss.  相似文献   
75.
76.
Annals of Surgical Oncology - The liver-first approach in patients with synchronous colorectal liver metastases (CRLM) has gained wide consensus but its role is still to be clarified. We aimed to...  相似文献   
77.
78.
79.
IntroductionAs we progress to an era when patient autonomy and shared decision-making are highly valued, there is a need to also have effective patient-centered communication tools. Radiology reports are designed for clinicians and can be very technical and difficult for patients to understand. It is important for patients to understand their magnetic resonance imaging (MRI) report in order to make an informed treatment decision with their physician. Therefore, we aimed to create a patient-centered prostate MRI report to give our patients a better understanding of their clinical condition.MethodsA prototype patient-centered radiology report (PACERR) was created by identifying items to include based on opinions sought from a group of patients undergoing prostate MRI and medical experts. Data was collected in semi-structured interviews using a salient belief question. A prototype PACERR was created in collaboration with human factors engineering and design, medical imaging, biomedical informatics, and cancer patient education groups.ResultsFifteen patients and eight experts from urology, radiation oncology, radiology, and nursing participated in this study. Patients were particularly interested to have a report with laymen terms, concise language, contextualization of values, definitions of medical terms, and next course of action. Everyone believed the report should include the risk of MRI findings actually being cancer in the subsequent biopsy.ConclusionsA prostate MRI PACERR has been developed to communicate the most important findings relevant to decision-making in prostate cancer using patient-oriented design principles. The ability of this tool to improve patient knowledge and communication will be explored.  相似文献   
80.
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