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   1237728篇
  免费   85148篇
  国内免费   4693篇
耳鼻咽喉   17246篇
儿科学   35939篇
妇产科学   35211篇
基础医学   174028篇
口腔科学   35535篇
临床医学   101646篇
内科学   252157篇
皮肤病学   26702篇
神经病学   95939篇
特种医学   49102篇
外国民族医学   411篇
外科学   196953篇
综合类   27635篇
现状与发展   1篇
一般理论   307篇
预防医学   79938篇
眼科学   28665篇
药学   91744篇
  1篇
中国医学   3772篇
肿瘤学   74637篇
  2018年   12979篇
  2017年   10143篇
  2016年   10785篇
  2015年   12281篇
  2014年   17421篇
  2013年   25719篇
  2012年   34590篇
  2011年   36358篇
  2010年   22088篇
  2009年   20976篇
  2008年   34574篇
  2007年   36952篇
  2006年   37011篇
  2005年   35795篇
  2004年   34215篇
  2003年   33138篇
  2002年   32463篇
  2001年   66041篇
  2000年   67929篇
  1999年   57153篇
  1998年   14649篇
  1997年   12933篇
  1996年   12485篇
  1995年   11535篇
  1994年   10874篇
  1993年   10091篇
  1992年   42501篇
  1991年   40251篇
  1990年   39083篇
  1989年   37922篇
  1988年   34870篇
  1987年   33988篇
  1986年   32267篇
  1985年   30476篇
  1984年   22070篇
  1983年   18562篇
  1982年   10539篇
  1981年   9047篇
  1979年   19646篇
  1978年   13310篇
  1977年   11394篇
  1976年   10234篇
  1975年   11426篇
  1974年   13562篇
  1973年   12874篇
  1972年   12308篇
  1971年   11557篇
  1970年   10946篇
  1969年   10415篇
  1968年   9805篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
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   
95.
96.
Psoriasis is a chronic, inflammatory, immune‐mediated disease. Approximately 30% of patients have disease onset before age 18 years. Psoriasis in children and adolescents may be difficult to control, with subsequent poor quality of life and psychosocial consequences. We describe the case of a 12‐year‐old boy with severe, refractory, chronic plaque psoriasis for 6 years. Various therapeutic regimens including different topical corticosteroids, topical vitamin D analogs, phototherapy, photochemotherapy, systemic therapy with methotrexate, cyclosporin, and combination therapies showed only partial or transient responses with frequent relapses. Because anti‐interleukin‐12/23 agents have been successfully used in adults with psoriasis, ustekinumab was initiated and our patient showed a rapid, excellent, sustained response. No recurrence or flares have been observed after 33 months of follow‐up. This case illustrates that ustekinumab may be an effective and safe therapeutic option in adolescents with psoriasis.  相似文献   
97.
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   
98.
99.
100.
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