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   2502篇
  免费   320篇
  国内免费   11篇
耳鼻咽喉   15篇
儿科学   104篇
妇产科学   29篇
基础医学   259篇
口腔科学   77篇
临床医学   295篇
内科学   494篇
皮肤病学   109篇
神经病学   185篇
特种医学   56篇
外科学   563篇
综合类   58篇
一般理论   5篇
预防医学   162篇
眼科学   137篇
药学   112篇
中国医学   4篇
肿瘤学   169篇
  2023年   55篇
  2022年   15篇
  2021年   65篇
  2020年   52篇
  2019年   75篇
  2018年   86篇
  2017年   70篇
  2016年   60篇
  2015年   73篇
  2014年   111篇
  2013年   127篇
  2012年   152篇
  2011年   154篇
  2010年   107篇
  2009年   80篇
  2008年   145篇
  2007年   153篇
  2006年   136篇
  2005年   147篇
  2004年   144篇
  2003年   116篇
  2002年   114篇
  2001年   15篇
  2000年   12篇
  1999年   12篇
  1998年   26篇
  1997年   20篇
  1996年   16篇
  1995年   21篇
  1994年   20篇
  1992年   16篇
  1990年   16篇
  1989年   19篇
  1988年   15篇
  1987年   13篇
  1986年   25篇
  1985年   11篇
  1984年   14篇
  1983年   26篇
  1982年   17篇
  1981年   22篇
  1980年   12篇
  1977年   14篇
  1975年   14篇
  1974年   14篇
  1973年   11篇
  1963年   12篇
  1962年   12篇
  1961年   14篇
  1960年   21篇
排序方式: 共有2833条查询结果,搜索用时 31 毫秒
1.

Background

Muscle invasive bladder cancer (MIBC) is prevalent in the older patients, who are a vulnerable population with multiple co-morbidities and at increased risk of complications. Radical cystectomy is often not suitable, hence radical radiotherapy (RT) is an alternative option. We reviewed the outcomes of older patients treated with RT with or without concurrent chemotherapy (CRT) at our institution.

Methods

We retrospectively reviewed patients aged 65?years and above treated with radical RT for MIBC at our institution between March 2002 to January 2017. Data was collected from institutional medical records and RT databases. The primary outcome was 2- and 5-year overall survival (OS), recurrence free survival (RFS), and toxicities. Univariate cox proportional hazard regression models were performed to identify independent factors with significant impact on survival.

Results

We identified 45 patients (34 males, 11 females) with a median age of 77?years (range 65–95). All patients received maximal transurethral resection of the bladder tumour prior to RT. Median dose of total RT was 64?Gy (range 50–69.8?Gy). Twenty one patients (47%) received CRT. Planned treatment was completed in 42 (93.3%) patients. Median follow-up was 31?months (range 1–147?months). The 2- and 5-year OS was 64% and 44%, respectively. The 2- and 5-year RFS was 68% and 49%, respectively. Median RFS was 34?months (range 8–121?months). Median OS was 56?months (range 18–100?months). Univariate analysis showed that performance status (0–1 vs. 2–3; HR 2.7, 95% CI 1.07–6.8, p?=?0.035) and International Society of Geriatric Oncology (SIOG) group (≤2 vs. >2; HR 3.23, 95% CI 1.12–8.64, p?=?0.019) were significantly associated with increased hazard for death. One patient (2%) had grade 3 cystitis.

Conclusion

Radical RT is well tolerated in older patients with MIBC. We report outcomes similar to published data. Older patients should be considered for curative treatment despite their age. However, careful selection is warranted as frail patients (PS ≥2; SIOG >2) may benefit less.  相似文献   
2.
3.
4.
The United States Medical Licensing Examination (USMLE®) Steps are a series of mandatory licensing assessments for all allopathic (MD degree) medical students in their transition from student to intern to resident physician. Steps 1, 2 Clinical Knowledge (CK), and 3 are daylong multiple-choice exams that quantify a medical student’s basic science and clinical knowledge as well as their application of that knowledge using a three-digit score. In doing so, these Steps provide a standardized assessment that residency programs use to differentiate applicants and evaluate their competitiveness. Step 2 Clinical Skills (CS), the only other Step exam and the second component of Step 2, was created in 2004 to test clinical reasoning and patient-centered skills. As a Pass/Fail exam without a numerical scoring component, Step 2 CS provides minimal differentiation among applicants for residency programs. In this personal view article, it is argued that the current Step 2 CS exam should be eliminated for US medical students and propose an alternative consistent with the mission and purpose of the exam that imposes less of a burden on medical students.  相似文献   
5.
Purpose: To assess amniotic membrane retention after amniotic membrane transplant in bullous keratopathy patients and whether there were any corneal structural changes that may hinder further penetrating keratoplasty

Methods: A retrospective study including 22 patients who have undergone amniotic membrane transplant from 1 Jan 1998 till 30 Jun 2016. Confocal microscopy and anterior segment optical coherence tomography (ASOCT) were performed to assess the retention of amniotic membrane and to detect any corneal structural changes. The comparison was made with 5 controls who had bullous keratopathy awaiting endothelial keratoplasty.

Results: Patients had a mean follow-up of 61 ± 33.7 months. Pain reduction was significant (p < .001) although it did not significantly correlate with the regularity of the superficial, intermediate or basal epithelial layers, nor with the retention of the amniotic membrane. No long-term structural changes that may hinder future penetrating keratoplasty were detected.

Conclusion: This procedure is a safe and effective long-term treatment for symptomatic bullous keratopathy patients.  相似文献   

6.
7.
8.
9.
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