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   718732篇
  免费   51001篇
  国内免费   1336篇
耳鼻咽喉   9489篇
儿科学   23698篇
妇产科学   17901篇
基础医学   112270篇
口腔科学   20232篇
临床医学   65177篇
内科学   136872篇
皮肤病学   16266篇
神经病学   51006篇
特种医学   26343篇
外国民族医学   76篇
外科学   106778篇
综合类   15007篇
现状与发展   2篇
一般理论   170篇
预防医学   52558篇
眼科学   16748篇
药学   54774篇
  3篇
中国医学   2368篇
肿瘤学   43331篇
  2021年   5741篇
  2019年   5707篇
  2018年   8217篇
  2017年   6379篇
  2016年   7070篇
  2015年   7830篇
  2014年   10695篇
  2013年   15978篇
  2012年   21397篇
  2011年   22374篇
  2010年   13282篇
  2009年   12369篇
  2008年   20751篇
  2007年   22310篇
  2006年   22759篇
  2005年   21245篇
  2004年   20644篇
  2003年   19637篇
  2002年   19081篇
  2001年   36584篇
  2000年   37131篇
  1999年   30621篇
  1998年   8048篇
  1997年   6786篇
  1996年   7096篇
  1995年   6714篇
  1994年   6187篇
  1992年   23131篇
  1991年   23103篇
  1990年   22471篇
  1989年   22219篇
  1988年   20168篇
  1987年   19568篇
  1986年   18592篇
  1985年   17437篇
  1984年   12806篇
  1983年   10838篇
  1982年   6000篇
  1979年   11603篇
  1978年   8215篇
  1977年   6903篇
  1976年   6665篇
  1975年   7327篇
  1974年   8572篇
  1973年   8200篇
  1972年   7714篇
  1971年   7171篇
  1970年   6917篇
  1969年   6345篇
  1968年   5814篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
101.
102.
103.
104.
105.
106.
107.
108.

Background

Partial nephrectomy (PN) is generally favored for cT1 tumors over radical nephrectomy (RN) when technically feasible. However, it can be unclear whether the additional risks of PN are worth the magnitude of renal function benefit.

Objective

To develop preoperative tools to predict long-term estimated glomerular filtration rate (eGFR) beyond 30 d following PN and RN, separately.

Design, setting, and participants

In this retrospective cohort study, patients who underwent RN or PN for a single nonmetastatic renal tumor between 1997 and 2014 at our institution were identified. Exclusion criteria were venous tumor thrombus and preoperative eGFR <15 ml/min/1.73 m2.

Intervention

RN and PN.

Outcome measurements and statistical analysis

Hierarchical generalized linear mixed-effect models with backward selection of candidate preoperative features were used to predict long-term eGFR following RN and PN, separately. Predictive ability was summarized using marginal RGLMM2, which ranges from 0 to 1, with higher values indicating increased predictive ability.

Results and limitations

The analysis included 1152 patients (13 206 eGFR observations) who underwent RN and 1920 patients (18 652 eGFR observations) who underwent PN, with mean preoperative eGFRs of 66 ml/min/1.73 m2 (standard deviation [SD] = 18) and 72 ml/min/1.73 m2 (SD = 20), respectively. The model to predict eGFR after RN included age, diabetes, preoperative eGFR, preoperative proteinuria, tumor size, time from surgery, and an interaction between time from surgery and age (marginal RGLMM2=0.41). The model to predict eGFR after PN included age, presence of a solitary kidney, diabetes, hypertension, preoperative eGFR, preoperative proteinuria, surgical approach, time from surgery, and interaction terms between time from surgery and age, diabetes, preoperative eGFR, and preoperative proteinuria (marginal RGLMM2). Limitations include the lack of data on renal tumor complexity and the single-center design; generalizability needs to be confirmed in external cohorts.

Conclusions

We developed preoperative tools to predict renal function outcomes following RN and PN. Pending validation, these tools should be helpful for patient counseling and clinical decision-making.

Patient summary

We developed models to predict kidney function outcomes after partial and radical nephrectomy based on preoperative features. This should help clinicians during patient counseling and decision-making in the management of kidney tumors.  相似文献   
109.

Aims

Variations of the anatomy of donor hepatic arteries increase the number of arterial anastomoses during liver transplantation and, possibly, the incidence of hepatic artery thrombosis (HAT). In this study, we describe the arterial anatomic variations in liver grafts procured and transplanted by a single center in Greece, the techniques of arterial anastomosis, and their effect on the incidence of early HAT.

Materials and Methods

From January 2013 to December 2017, the arterial anatomy of 116 grafts procured for liver transplantation were recorded, as well as the technique of arterial anastomosis and the incidence of early hepatic artery thrombosis (HAT <30 days).

Results

A single hepatic artery was recorded in 72.41% of the procured grafts, an aberrant left hepatic artery (accessory or replaced) in 18 grafts (15.52%), and an aberrant right hepatic artery (accessory or replaced) in 17 grafts (14.66%), while other variations were observed in less than 1% of the procured livers. Of the 116 primary liver transplantations, 6 patients (5.17%) developed early HAT <30 days. Two of these patients (1.72%) had 1 anastomosis of the hepatic artery and 4 (3.45%) had 2 anastomoses due to anatomic variations.

Conclusions

Anatomic variations of the hepatic artery in liver grafts is a common finding and increase the incidence of early HAT but not to a degree to make these grafts unusable.  相似文献   
110.
Hawi  N.  von Falck  C.  Krettek  C.  Meller  R. 《Der Unfallchirurg》2019,122(12):944-949
Die Unfallchirurgie - Zur Diagnostik von Schultergelenkerkrankungen wird routinemäßig die Magnetresonanztomographie (MRT) durchgeführt. Diese kann entsprechend der klinischen...  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