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   220316篇
  免费   4297篇
  国内免费   195篇
耳鼻咽喉   1499篇
儿科学   8164篇
妇产科学   4174篇
基础医学   22903篇
口腔科学   2159篇
临床医学   17235篇
内科学   40157篇
皮肤病学   1545篇
神经病学   21769篇
特种医学   9953篇
外科学   32749篇
综合类   2687篇
一般理论   58篇
预防医学   23526篇
眼科学   3327篇
药学   12325篇
中国医学   709篇
肿瘤学   19869篇
  2024年   61篇
  2023年   659篇
  2022年   1107篇
  2021年   2184篇
  2020年   1307篇
  2019年   1802篇
  2018年   23628篇
  2017年   18490篇
  2016年   20803篇
  2015年   2558篇
  2014年   2806篇
  2013年   3375篇
  2012年   11067篇
  2011年   24912篇
  2010年   20737篇
  2009年   13269篇
  2008年   22260篇
  2007年   24396篇
  2006年   3277篇
  2005年   4692篇
  2004年   5606篇
  2003年   6328篇
  2002年   4166篇
  2001年   471篇
  2000年   566篇
  1999年   388篇
  1998年   552篇
  1997年   464篇
  1996年   299篇
  1995年   279篇
  1994年   219篇
  1993年   177篇
  1992年   117篇
  1991年   166篇
  1990年   192篇
  1989年   141篇
  1988年   118篇
  1987年   90篇
  1986年   78篇
  1985年   84篇
  1984年   76篇
  1983年   75篇
  1982年   69篇
  1981年   46篇
  1980年   69篇
  1977年   32篇
  1938年   60篇
  1934年   30篇
  1932年   56篇
  1930年   47篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
Gastroesophageal reflux is the most common benign disorder of the esophagus and laparoscopic Nissen fundoplication has become the standard surgical treatment for its treatment. In our area, where the use of bougie calibration is debatable, postoperative dysphagia is encountered often after this surgery although it is usually not permanent. The aim of this study was to investigate the effect of using a soft silicone tube 39 F in diameter for esophageal calibration during laparoscopic Nissen fundoplication on the incidence of postoperative dysphagia. We divided cases scheduled to undergo laparoscopic Nissen fundoplication between January 2009 and November 2010 into two groups, each consisting 25 patients. Esophageal calibration with a 39 F silicone orogastric tube was used for the first group while there was no operative calibration in the second group. The surgical duration was recorded; the presence and severity of the postoperative dysphagia was calculated by using a dysphagia severity scoring system during the 1-year postoperative follow-up. The dysphagia severity scores were significantly lower in group 1 than group 2 on the postoperative second day and at the end of the first week and first month. We did not find a significant difference at the end of the 6-month and first year. There was also no significant difference regarding surgery duration. The use of a soft orogastric tube 39 F in diameter for esophagus calibration during laparoscopic Nissen fundoplication has significantly decreased the incidence of postoperative transient dysphagia without affecting the duration of surgery. Although dysphagia gradually resolves in the majority of patients, a safe and easy calibration method for its prevention is worth developing, and we believe that the use of our method in larger series could be beneficial.  相似文献   
8.
9.

Background

Radium 223 was introduced for metastatic castration-resistant prostate cancer based on the results of a randomized controlled trial showing risk reduction for death and skeletal events. Our aim was to evaluate the outcome of patients receiving radium 223 in a real-world setting.

Patients and Methods

We conducted a multicenter retrospective analysis in the Triveneto region of Italy.

Results

One hundred fifty-eight patients received radium 223 in our region. After a median follow-up of 9.5 months, 75 patients died. The median overall survival (OS) was 14.2 months, and the median progression-free survival (PFS) was 6.2 months. Seventy-one (45%) patients achieved progression as best response. Thirty-seven (23%) patients stopped the treatment early because of progression. Eastern Cooperative Oncology Group performance status was prognostic for OS (18.4 vs. 12.3 vs. 7.5 months; 0 vs. 1, P = .0062; 0 vs. 2, P = .0002), whereas previous prostatectomy or docetaxel exposure were not. A neutrophil to lymphocytes ratio ≥ 3 significantly impacted OS (18.1 vs. 9.7 months; P < .001) and slightly impacted PFS (6.6 vs. 5.6 months; P = .05). Patients with a baseline alkaline phosphatase (ALP) value ≥ 220 U/L had worse OS and PFS (24.1 vs. 10.5 months; 7.2 vs. 5.5 months; P < .001). Patients with changes in ALP value achieved better OS (P = .029) and PFS (P = .002). There was no difference according to the line of therapy (0 vs. ≥ 1; P = .490). The main grade 3/4 toxicities were anemia, asthenia, and thrombocytopenia.

Conclusion

This large real-world report confirms comparable OS and PFS data when compared with the pivotal study, as well as the predictive role of ALP and neutrophil to lymphocytes ratio. The definition of the optimal position of radium 223 in the treatment of metastatic castration-resistant prostate cancer has still to be defined.  相似文献   
10.
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