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   2118篇
  免费   152篇
  国内免费   21篇
耳鼻咽喉   15篇
儿科学   45篇
妇产科学   15篇
基础医学   306篇
口腔科学   52篇
临床医学   174篇
内科学   497篇
皮肤病学   27篇
神经病学   109篇
特种医学   107篇
外科学   285篇
综合类   223篇
一般理论   3篇
预防医学   95篇
眼科学   37篇
药学   89篇
中国医学   3篇
肿瘤学   209篇
  2023年   18篇
  2022年   40篇
  2021年   119篇
  2020年   54篇
  2019年   53篇
  2018年   68篇
  2017年   48篇
  2016年   55篇
  2015年   77篇
  2014年   86篇
  2013年   94篇
  2012年   132篇
  2011年   158篇
  2010年   80篇
  2009年   85篇
  2008年   96篇
  2007年   104篇
  2006年   92篇
  2005年   94篇
  2004年   84篇
  2003年   73篇
  2002年   64篇
  2001年   47篇
  2000年   66篇
  1999年   54篇
  1998年   40篇
  1997年   33篇
  1996年   28篇
  1995年   12篇
  1994年   14篇
  1993年   12篇
  1992年   16篇
  1991年   31篇
  1990年   17篇
  1989年   30篇
  1988年   13篇
  1987年   15篇
  1986年   17篇
  1985年   16篇
  1984年   9篇
  1983年   12篇
  1982年   6篇
  1981年   4篇
  1980年   4篇
  1979年   4篇
  1978年   4篇
  1977年   5篇
  1976年   3篇
  1973年   2篇
  1971年   1篇
排序方式: 共有2291条查询结果,搜索用时 15 毫秒
81.
82.
Journal of Natural Medicines - From the methanolic extract of the leaves of Lansium domesticum, three new onoceranoid-type triterpenoids, lansium acids X–XII and a new cycloartane-type...  相似文献   
83.
This overview provides a guideline for the management of stable ischemic heart disease. It represents the work of a primary and secondary panel of participants from across Canada who achieved consensus on behalf of the Canadian Cardiovascular Society. The suggestions and recommendations are intended to be of relevance to primary care and specialist physicians with an emphasis on rational deployment of diagnostic tests, expedited implementation of long- and short-term medical therapy, timely consideration of revascularization, and practical follow-up measures.  相似文献   
84.

Background

Visit-to-visit blood pressure variability (BPV) is a simple surrogate marker for the development of atherosclerotic diseases, cardiovascular and all-cause mortality. Nevertheless, the relative prognostic value of BPV in comparison with other established vascular assessments remain uncertain.

Methods

We prospectively followed-up 656 high-risk patients with diabetes or established cardiovascular or cerebrovascular diseases for the occurrence of major adverse cardiovascular events (MACEs). Baseline brachial endothelial function, carotid intima-media thickness (IMT) and plaque burden, ankle-brachial index and arterial stiffness were determined. Visit-to-visit BPV were recorded during a mean 18 ± 9 outpatient clinic visits.

Results

After a mean 81 ± 12 month's follow-up, 123 patients (19%) developed MACEs. Patients who developed a MACE had significantly higher systolic BPV, more severe endothelial function, arterial stiffness and systemic atherosclerotic burden compared to patients who did not develop a MACE (all P < 0.01). BPV significantly correlated with all of the vascular assessments (P < 0.01). A high carotid IMT had the greatest prognostic value in predicting development of a MACE (area under receiver operating characteristic curve (AUC) 0.69 ± 0.03, P < 0.01). A high BPV also had moderate prognostic value in prediction of MACE (AUC 0.65 ± 0.03, P < 0.01). After adjustment of confounding factors, a high BPV remained a significant independent predictor of MACE (hazards ratio 1.67, 95% confidence interval 1.14-2.43, P < 0.01).

Conclusions

Compared with established surrogate markers of atherosclerosis, visit-to-visit BPV provides similar prognostic information and may represent a new and simple marker for adverse outcomes in patients with vascular diseases.  相似文献   
85.
86.
INTRODUCTIONWe aimed to review the necessity of conventional interventions in renal transplant for preventing complications arising out of the use of wound drains, ureteral stents and stapled skin closures.METHODSWe reviewed a series of 33 patients who received stentless, tubeless/drainless and suture-apposed living donor renal transplants (STAR group) and compared the results to a control non-STAR group of 36 patients in whom all three interventions of drains, stents and skin staples were used.RESULTSNo significant differences in demographics and clinical characteristics were observed between the two groups. With regard to the overall surgical complications, no significant differences in terms of wound infection, seroma, perinephric collections, urinoma, bacteriuria or vascular complications were observed between the groups. When analysed according to the interventions specific for preventing complications, although slightly more asymptomatic perinephric collections were observed and two lymphoceles required treatment in the STAR group, these differences were not statistically significant. Similarly, no significant differences in ureteric or skin-related complications were observed between the groups. Both groups had comparable good outcomes for renal function, graft survival and patient survival.CONCLUSIONThe routine use of ureteric stents, drains or skin staples may not be necessary for uncomplicated renal transplants. Potential complications associated with the placement of these interventions can be avoided without compromising on the safety of patients and/or the outcome of transplants.  相似文献   
87.
INTRODUCTIONPatients with chronic diseases face difficulties when navigating the healthcare system. Using the Healthcare System Hassles Questionnaire (HSHQ) developed by Parchman et al, this study aimed to explore the degree of hassles faced by patients in primary care in Singapore and identify the characteristics associated with greater hassles.METHODSA cross-sectional study was conducted on patients with chronic diseases at Hougang Polyclinic, Singapore, using the interviewer-administered HSHQ. The mean HSHQ score was compared with that reported by Parchman et al. The associations between the number of chronic diseases, demographic variables and healthcare hassles were assessed using multivariate linear logistic regression analysis.RESULTSIn total, 217 outpatients aged 21 years and above were enrolled. Their overall mean HSHQ score (4.77 ± 6.18) was significantly lower than that of patients in the study by Parchman et al (15.94 ± 14.23, p < 0.001). Patients with five or more chronic diseases scored 3.38 (95% confidence interval [CI] 0.11–6.65, p = 0.043) points higher than those with one chronic disease did. With each increasing year of age, the mean HSHQ score decreased by 0.17 (95% CI −0.26 to −0.08, p = 0.001) points. Patients with polytechnic/diploma/university education and higher scored 2.65 (95% CI 0.19–5.11, p = 0.035) points higher than those with primary education and lower did.CONCLUSIONPatients in our population reported less hassles than those in the study by Parchman et al did. Increasing age and lower education level were associated with less hassles. Further analysis of the types of chronic diseases may yield new information about the association of healthcare hassles with the number and types of chronic diseases.  相似文献   
88.
As the number of cases of coronavirus disease 2019 (COVID‐19) caused by the virus SARS‐CoV‐2 rises exponentially in Australia with consequences for the health system and society at large, we need to remember that during this pandemic that necessary social distancing measures, effective school closures and rising unemployment levels may lead to an increased risk for child abuse and neglect.  相似文献   
89.
90.
Social Psychiatry and Psychiatric Epidemiology - Our study explored whether aspects of veterans’ social connectedness (social support, interpersonal conflict, loneliness, social norms, number...  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