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   3006175篇
  免费   241633篇
  国内免费   6126篇
耳鼻咽喉   42956篇
儿科学   95769篇
妇产科学   81758篇
基础医学   426742篇
口腔科学   86958篇
临床医学   275283篇
内科学   583156篇
皮肤病学   63683篇
神经病学   249789篇
特种医学   119226篇
外国民族医学   1131篇
外科学   453179篇
综合类   72407篇
现状与发展   1篇
一般理论   1286篇
预防医学   243911篇
眼科学   71065篇
药学   222994篇
  7篇
中国医学   5724篇
肿瘤学   156909篇
  2018年   31097篇
  2016年   26717篇
  2015年   30049篇
  2014年   42958篇
  2013年   65753篇
  2012年   87976篇
  2011年   92971篇
  2010年   55129篇
  2009年   52512篇
  2008年   87947篇
  2007年   93596篇
  2006年   94617篇
  2005年   91900篇
  2004年   88903篇
  2003年   85694篇
  2002年   84006篇
  2001年   137806篇
  2000年   142609篇
  1999年   120346篇
  1998年   35022篇
  1997年   31765篇
  1996年   31396篇
  1995年   30432篇
  1994年   28575篇
  1993年   26538篇
  1992年   97282篇
  1991年   94308篇
  1990年   91386篇
  1989年   88106篇
  1988年   81405篇
  1987年   80565篇
  1986年   76139篇
  1985年   72976篇
  1984年   55321篇
  1983年   47199篇
  1982年   28794篇
  1981年   25667篇
  1980年   24045篇
  1979年   52002篇
  1978年   36741篇
  1977年   31069篇
  1976年   29293篇
  1975年   30771篇
  1974年   37911篇
  1973年   36071篇
  1972年   33667篇
  1971年   31256篇
  1970年   29213篇
  1969年   27226篇
  1968年   24879篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
181.
182.
183.
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   
184.
185.
186.
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   
187.
188.
189.
190.
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