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   3625篇
  免费   376篇
  国内免费   41篇
耳鼻咽喉   26篇
儿科学   140篇
妇产科学   67篇
基础医学   337篇
口腔科学   10篇
临床医学   481篇
内科学   1358篇
皮肤病学   75篇
神经病学   320篇
特种医学   49篇
外科学   332篇
综合类   141篇
预防医学   303篇
眼科学   37篇
药学   187篇
  1篇
中国医学   10篇
肿瘤学   168篇
  2024年   12篇
  2023年   74篇
  2022年   28篇
  2021年   74篇
  2020年   76篇
  2019年   35篇
  2018年   138篇
  2017年   132篇
  2016年   121篇
  2015年   111篇
  2014年   110篇
  2013年   138篇
  2012年   288篇
  2011年   371篇
  2010年   100篇
  2009年   122篇
  2008年   263篇
  2007年   261篇
  2006年   196篇
  2005年   228篇
  2004年   300篇
  2003年   224篇
  2002年   196篇
  2001年   94篇
  2000年   55篇
  1999年   37篇
  1998年   45篇
  1997年   18篇
  1996年   11篇
  1995年   17篇
  1994年   19篇
  1993年   6篇
  1992年   15篇
  1991年   6篇
  1990年   14篇
  1989年   8篇
  1988年   7篇
  1987年   7篇
  1986年   21篇
  1985年   10篇
  1984年   7篇
  1983年   3篇
  1981年   3篇
  1979年   8篇
  1977年   5篇
  1970年   2篇
  1968年   2篇
  1966年   3篇
  1965年   2篇
  1946年   2篇
排序方式: 共有4042条查询结果,搜索用时 15 毫秒
121.
122.
123.
Purpose of this study was to assess whether living (LD) and deceased donor (DD) kidney transplant recipients differ in health‐related quality of life (HRQoL), fatigue and societal participation, depending on time since transplantation and after adjustment for clinical and demographic variables. A questionnaire study was performed among 309 LD and 226 DD recipients (response rate 74% and 61%) transplanted between 1997 and 2009. After adjustment for age, sex, and education, LD recipients transplanted less than or equal to five yr ago experienced better HRQoL than DD recipients on the domains' role limitations due to physical problems, general health perception, and on the physical component summary score (all p < 0.05) and a better societal participation (all subscales, p < 0.05). No differences were found in the mental health domains. The LD recipients also had better renal clearance than DD recipients (62.1 vs. 55.9 mL/min, p = 0.01). After additional adjustment for renal clearance, the differences in HRQoL and societal participation between LD and DD recipients remained. No differences were found in recipients transplanted more than five yr ago. We conclude that LD recipients on average have better HRQoL and societal participation than DD recipients, in the first years after transplantation.  相似文献   
124.
125.
126.
127.

Introduction

Experience from interdisciplinary cooperation revealed the need for a prostate mapping scheme to communicate multiparametric MRI (mpMRI) findings between radiologists, urologists, and pathologists, which should be detailed, yet easy to memorize. For this purpose, the ‘Prostate interdisciplinary communication and mapping algorithm for biopsy and pathology’ (PIC-MABP) was developed. This study evaluated the accuracy of the PIC-MABP system.

Methods

PIC-MABP was tested and validated in findings of 10 randomly selected patients from routine clinical practise with 18 histologically proven cancer lesions. Patients received an mpMRI of the prostate prior to prostatectomy. After surgery the prostates were prepared as whole-mount step sections. Cancer lesions, which were found suspicious on mpMRI, were assigned to the according PIC-MABP sectors by a radiologist. MpMRI slides were masked and sent to seven urologists from different centres, providing only the PIC-MABP location of each lesion. Urologists marked the accordant regions. Then mpMRI slides were unmasked, and the correctness of each mark was evaluated.

Results

One hundred and seventeen of the 126 marks (93 %) were correctly assigned. Detection rates differed for lesions >0.5 cc compared with lesions <0.5 cc (p < 0.005): 3/7 (43 %) marks were correctly assigned in lesions <0.3 cc, 16/21 (76 %) in lesions with 0.3–0.5 cc, and 98/98 (100 %) in lesions >0.5 cc. Interobserver agreement was good for lesions >0.5 cc and poor for lesions <0.3 cc (Fleiss Kappa 1 vs. 0.0175).

Conclusion

PIC-MABP seems to be a reliable system to communicate the location of mpMRI findings >0.5 cc between different disciplines and can be a useful guidance for cognitive mpMRI/TRUS fusion biopsy.
  相似文献   
128.
In contrast to traditional approaches to fracture risk assessment using clinical risk factors and bone mineral density (BMD), a new technique, reference point microindentation (RPI), permits direct assessment of bone quality; in vivo tibial RPI measurements appear to discriminate patients with a fragility fracture from controls. However, it is unclear how this relates to the site of the most clinically devastating fracture, the femoral neck, and whether RPI provides information complementary to that from existing assessments. Femoral neck samples were collected at surgery after low‐trauma hip fracture (n = 46; 17 male; aged 83 [interquartile range 77–87] years) and compared, using RPI (Biodent Hfc), with 16 cadaveric control samples, free from bone disease (7 male; aged 65 [IQR 61–74] years). A subset of fracture patients returned for dual‐energy X‐ray absorptiometry (DXA) assessment (Hologic Discovery) and, for the controls, a micro‐computed tomography setup (HMX, Nikon) was used to replicate DXA scans. The indentation depth was greater in femoral neck samples from osteoporotic fracture patients than controls (p < 0.001), which persisted with adjustment for age, sex, body mass index (BMI), and height (p < 0.001) but was site‐dependent, being less pronounced in the inferomedial region. RPI demonstrated good discrimination between fracture and controls using receiver‐operating characteristic (ROC) analyses (area under the curve [AUC] = 0.79 to 0.89), and a model combining RPI to clinical risk factors or BMD performed better than the individual components (AUC = 0.88 to 0.99). In conclusion, RPI at the femoral neck discriminated fracture cases from controls independent of BMD and traditional risk factors but dependent on location. The clinical RPI device may, therefore, supplement risk assessment and requires testing in prospective cohorts and comparison between the clinically accessible tibia and the femoral neck. © 2015 American Society for Bone and Mineral Research.  相似文献   
129.
130.

Background

Between 2 and 8 weeks before surgery, most bariatric surgery groups establish strict dietary treatments with a total caloric intake of less than 1,000 kcal/day in order to maximize weight loss during this period of time.

Methods

A prospective randomized clinical trial of all the patients undergoing laparoscopic sleeve gastrectomy (LSG) was performed. Patients were randomly assigned into 3 groups: those patients receiving a preoperative regular diet of 900 kcal/day (group 1), those receiving a preoperative balanced energy high-protein formula (group 2) and those receiving preoperative Immunonutrition (group 3). Preoperative weight loss, postoperative pain, complications and analytical acute phase reactants were investigated.

Results

Sixty patients were included in the study, 20 in each group. Preoperative excess weight loss was 7.7 % in group 1, 12.3 % in group 2 and 15.3 % in group 3 (p?=?0.014). Median postoperative pain was 3.5 in group 1, 3 in group 2 and 2 in group 3 (p?=?0.048). C-reactive protein determined 24 h after surgery was significantly lower in group 3 than in the other groups. AST and ALT values were significantly lower in group 3 than in the other groups, without significant differences between groups 1 and 2.

Conclusions

Preoperative diet with Immunonutrition formulas during 2 weeks achieves a greater preoperative weight loss, lower postoperative pain and lower values of CRP and liver enzymes than high-protein formulas or regular diet, all of them with similar caloric intake.
  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