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   13562篇
  免费   1003篇
  国内免费   37篇
耳鼻咽喉   90篇
儿科学   495篇
妇产科学   355篇
基础医学   1832篇
口腔科学   174篇
临床医学   1707篇
内科学   2411篇
皮肤病学   269篇
神经病学   1321篇
特种医学   292篇
外科学   1682篇
综合类   202篇
一般理论   26篇
预防医学   1522篇
眼科学   165篇
药学   936篇
中国医学   32篇
肿瘤学   1091篇
  2023年   55篇
  2022年   53篇
  2021年   235篇
  2020年   188篇
  2019年   283篇
  2018年   346篇
  2017年   204篇
  2016年   258篇
  2015年   264篇
  2014年   415篇
  2013年   637篇
  2012年   966篇
  2011年   882篇
  2010年   518篇
  2009年   523篇
  2008年   863篇
  2007年   951篇
  2006年   830篇
  2005年   909篇
  2004年   822篇
  2003年   813篇
  2002年   727篇
  2001年   144篇
  2000年   128篇
  1999年   148篇
  1998年   140篇
  1997年   141篇
  1996年   101篇
  1995年   114篇
  1994年   82篇
  1993年   96篇
  1992年   105篇
  1991年   99篇
  1990年   79篇
  1989年   93篇
  1988年   77篇
  1987年   75篇
  1986年   68篇
  1985年   96篇
  1984年   66篇
  1983年   71篇
  1982年   84篇
  1981年   78篇
  1980年   63篇
  1979年   48篇
  1978年   75篇
  1977年   61篇
  1976年   35篇
  1975年   37篇
  1973年   36篇
排序方式: 共有10000条查询结果,搜索用时 30 毫秒
991.
PTSD affects a substantial number of women in medical settings and is associated with significant distress and impairment. There are effective methods of treating trauma-related distress, but a minority seek such care. Thus, primary care is an important setting in which to identify individuals with PTSD. We sent questionnaires, including the PTSD Checklist—Civilian Version (PCL-C), to 419 female veterans who were seen in our primary care clinic in 1998; 56% (N = 221) returned the measures. A random subset (n = 49) was interviewed to establish psychiatric diagnoses. The results provide qualified support for the use of the PCL-C total score with a lowered cutoff score as a screening measure for PTSD in female veterans in primary care.  相似文献   
992.
Hepatic epithelioid hemangioendothelioma (HEHE) is a rare liver tumor with an indolent course relative to other hepatic malignancies. Over the past two decades, primary treatment for these lesions has been defined as resection for localized disease, or transplantation for diffuse and multifocal tumors. No published report to date has described effective pre- or post-operative adjuvant treatment for this disease. In this report, we present the first case of HEHE effectively managed with chemoembolization followed by transplantation, documenting objective tumor response to embolization. Furthermore, diagnosis for this lesion can easily be mistaken, directing management in erroneous directions. This case illustrates diagnostic pitfalls affiliated with the work-up of this tumor.  相似文献   
993.
Case 55: fetus in fetu   总被引:2,自引:0,他引:2  
  相似文献   
994.
995.
OBJECT: The surgical treatment of Parkinson disease (PD) has undergone a dramatic shift, from stereotactic ablative procedures toward deep brain stimulaion (DBS). The authors studied this process by investigating practice patterns, mortality and morbidity rates, and hospital charges as reflected in the records of a representative sample of US hospitals between 1996 and 2000. METHODS: The authors conducted a retrospective cohort study by using the Nationwide Inpatient Sample database; 1761 operations at 71 hospitals were studied. Projected to the US population, there were 1650 inpatient procedures performed for PD per year (pallidotomies, thalamotomies, and DBS), with no significant change in the annual number of procedures during the study period. The in-hospital mortality rate was 0.2%, discharge other than to home was 8.1%, and the rate of neurological complications was 1.8%, with no significant differences between procedures. In multivariate analyses, hospitals with larger annual caseloads had lower mortality rates (p = 0.002) and better outcomes at hospital discharge (p = 0.007). Placement of deep brain stimulators comprised 0% of operations in 1996 and 88% in 2000. Factors predicting placement of these devices in analyses adjusted for year of surgery included younger age, Caucasian race, private insurance, residence in higher-income areas, hospital teaching status, and smaller annual hospital caseload. In multivariate analysis, total hospital charges were 2.2 times higher for DBS (median dollar 36,000 compared with dollar 12,000, p < 0.001), whereas charges were lower at higher-volume hospitals (p < 0.001). CONCLUSIONS: Surgical treatment of PD in the US changed significantly between 1996 and 2000. Larger-volume hospitals had superior short-term outcomes and lower charges. Future studies should address long-term functional end points, cost/benefit comparisons, and inequities in access to care.  相似文献   
996.
997.
Significant numbers of patients at risk for coronary heart disease (CHD) fail to reach National Cholesterol Education Program (NCEP)-designated low density lipoprotein cholesterol (LDL-C) goals in spite of the wide range of currently available treatments, including combination therapies. Ezetimibe, the first in a class of novel cholesterol absorption inhibitors, demonstrated lipid-lowering and antiatherosclerotic activity in experimental and clinical hypercholesterolemia. Studies in hypercholesterolemic dogs showed that ezetimibe coadministered with statins caused greater lipid-lowering effects compared to either drug alone. These effects were confirmed in clinical studies of patients with primary hypercholesterolemia where initiation of treatment with ezetimibe plus a statin, or addition of ezetimibe to ongoing statin therapy, produced significant incremental reductions in LDL-C, as well as incremental increases in high-density lipoprotein cholesterol (HDL-C) and reductions in triglyceride levels. Combination therapy also significantly increased the number of patients attaining LDL-C goal at the end of treatment, compared to statin monotherapy. In studies using simvastatin, atorvastatin, pravastatin, and lovastatin, addition of ezetimibe to low dose statin was as effective as a 2- to 3-fold upward titration of the corresponding statin dose. Ezetimibe-statin combination therapy provided similar improvements in patients with primary hypercholesterolemia, as well as with heterozygous and homozygous familial hypercholesterolemia. Ezetimibe monotherapy effectively reduced plasma campesterol and sitosterol in patients with homozygous sitosterolemia. Clinical studies showed that ezetimibe was well tolerated, with a safety profile comparable to placebo when administered as monotherapy and comparable to statin alone when coadministered with a statin. These data provide strong evidence that, through their complementary lipid-lowering mechanisms, ezetimibe coadministered with a statin offers an effective combination treatment option for patients with hypercholesterolemia, including those with genetically inherited disease.  相似文献   
998.
999.
1000.
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