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   975999篇
  免费   71072篇
  国内免费   1439篇
耳鼻咽喉   13395篇
儿科学   26070篇
妇产科学   24455篇
基础医学   138544篇
口腔科学   28647篇
临床医学   86402篇
内科学   191345篇
皮肤病学   20123篇
神经病学   76814篇
特种医学   37700篇
外国民族医学   79篇
外科学   156761篇
综合类   18414篇
现状与发展   2篇
一般理论   319篇
预防医学   68304篇
眼科学   22071篇
药学   75732篇
  3篇
中国医学   2216篇
肿瘤学   61114篇
  2021年   7255篇
  2019年   7564篇
  2018年   10717篇
  2017年   8365篇
  2016年   9194篇
  2015年   10349篇
  2014年   14104篇
  2013年   20278篇
  2012年   28238篇
  2011年   29092篇
  2010年   17027篇
  2009年   16097篇
  2008年   27815篇
  2007年   28841篇
  2006年   29406篇
  2005年   28175篇
  2004年   26930篇
  2003年   25618篇
  2002年   24886篇
  2001年   54928篇
  2000年   56674篇
  1999年   47152篇
  1998年   11013篇
  1997年   9664篇
  1996年   9756篇
  1995年   9074篇
  1994年   8384篇
  1993年   7685篇
  1992年   35550篇
  1991年   33953篇
  1990年   32778篇
  1989年   31922篇
  1988年   29027篇
  1987年   28275篇
  1986年   26313篇
  1985年   25170篇
  1984年   17869篇
  1983年   15178篇
  1982年   7810篇
  1979年   15795篇
  1978年   10619篇
  1977年   9068篇
  1976年   7887篇
  1975年   8647篇
  1974年   10470篇
  1973年   9874篇
  1972年   9367篇
  1971年   8860篇
  1970年   8431篇
  1969年   7928篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
65.
PurposeOur purpose was to determine the effect of chemoradiotherapy (CRT) on patient-reported quality of life (QOL) for patients with intact pancreas cancer.Methods and MaterialsWe reviewed a prospective QOL registry for patients with intact, clinically localized pancreatic ductal adenocarcinoma treated with CRT between June 2015 and November 2018. QOL was assessed pre-CRT (immediately before CRT, after neoadjuvant chemotherapy) and at the completion of CRT with the Functional Assessment of Cancer Therapy-Hepatobiliary (FACT-Hep) and its component parts: FACT-General (FACT-G) and hepatobiliary cancer subscore (HCS). A minimally important difference from pre-CRT was defined as ≥ 6, 5, and 8 points for FACT-G, HCS, and FACT-Hep, respectively.ResultsOf 157 patients who underwent CRT, 100 completed both pre- and post-CRT surveys and were included in the primary analysis. Median age at diagnosis was 65 years (range, 23-90). National Comprehensive Cancer Network resectability status was resectable (3%), borderline resectable (40%), or locally advanced (57%). Folinic acid, 5-fluorouracil, irinotecan, and oxaliplatin (FOLFIRINOX) (75%) or gemcitabine and nab-paclitaxel (42%) were given for a median of 6 cycles (range, 0-42) before CRT. Radiation therapy techniques included 3-dimensional conformal (22%), intensity modulated photon (55%), and intensity modulated proton (23%) radiation therapy to a median dose of 50 Gy (range, 36-62.5). Concurrent chemotherapy was most commonly capecitabine (82%). Sixty-three patients (63%) had surgery after CRT. The mean decline in FACT-G, HCS subscale, and FACT-Hep from pre- to post-CRT was 3.5 (standard deviation [SD], 13.7), 1.7 (SD 7.8), and 5.2 (SD 19.4), respectively. Each of these changes were statistically significant, but did not meet the minimally important difference threshold. Pancreatic head tumor location was associated with decline in FACT-Hep. Nausea was the toxicity with the greatest increase from pre- to post-CRT by both physician-assessment and patient-reported QOL.ConclusionsFor patients with intact pancreatic adenocarcinoma, modern CRT is well tolerated with minimal decline in QOL during treatment.  相似文献   
66.
ABSTRACT

Objective

To investigate primary care physician clinical practice patterns, barriers, and education surrounding pediatric physical activity (PA), and to compare practice patterns by discipline.  相似文献   
67.
68.
69.
70.
We report a case of intestinal obstruction in a 73-year-old woman caused by ileocolic intussusception. The underlying cause was a giant submucosal ulcerating lipoma (6?×?3.3?×?3.8 cm) extending from the superior mucosal lip of Bauhin’s valve. Abdominal ultrasonography showed a pathognomonic target-like mass appearing as multiple concentric rings. CT scan confirmed the diagnosis. Because of apparent obstruction, a laparotomy with right hemicolectomy and ileocolic anastomosis was performed. Lipomas most frequently occur in the cecum and ascending colon where they represent the most common submucosal mesenchymal tumor. They typically occur in elderly women with an incidence that varies from 0.15 to 0.56 %. Pain, rectal bleeding, and obstruction are typical symptoms. When faced with an intussusception in children, reduction with air per rectum can be performed. In adults, however, malignant cell spreading and seeding is of big concern. Since approximately 20–50 % of all underlying causes are malignant, explorative surgery is favored in adults.  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