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   1693935篇
  免费   126716篇
  国内免费   4047篇
耳鼻咽喉   21743篇
儿科学   55616篇
妇产科学   46193篇
基础医学   241562篇
口腔科学   48793篇
临床医学   151456篇
内科学   333418篇
皮肤病学   38662篇
神经病学   131269篇
特种医学   63969篇
外国民族医学   249篇
外科学   257373篇
综合类   39466篇
现状与发展   5篇
一般理论   531篇
预防医学   124136篇
眼科学   40215篇
药学   123892篇
  8篇
中国医学   4631篇
肿瘤学   101511篇
  2021年   12978篇
  2019年   13638篇
  2018年   20057篇
  2017年   15324篇
  2016年   16706篇
  2015年   19122篇
  2014年   26404篇
  2013年   38119篇
  2012年   53012篇
  2011年   55695篇
  2010年   32923篇
  2009年   30815篇
  2008年   51698篇
  2007年   54965篇
  2006年   55419篇
  2005年   52736篇
  2004年   50861篇
  2003年   48292篇
  2002年   46464篇
  2001年   91841篇
  2000年   93680篇
  1999年   77035篇
  1998年   19779篇
  1997年   17337篇
  1996年   17432篇
  1995年   16781篇
  1994年   15321篇
  1993年   14097篇
  1992年   57401篇
  1991年   55292篇
  1990年   52983篇
  1989年   50764篇
  1988年   46139篇
  1987年   44943篇
  1986年   42235篇
  1985年   39989篇
  1984年   29354篇
  1983年   24915篇
  1982年   13902篇
  1979年   25534篇
  1978年   17577篇
  1977年   14907篇
  1976年   13877篇
  1975年   14563篇
  1974年   17630篇
  1973年   16945篇
  1972年   15664篇
  1971年   14435篇
  1970年   13415篇
  1969年   12504篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
1.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
2.
Die Anaesthesiologie - Auch wenn für Anästhesiologen über Jahrzehnte die Prophylaxe und Therapie postoperativer Schmerzen im Rahmen des postoperativen Patientenkomforts an vorderster...  相似文献   
3.
4.
5.
6.
7.
PurposeUnderstanding the value of genetic screening and testing for monogenic disorders requires high-quality, methodologically robust economic evaluations. This systematic review sought to assess the methodological quality among such studies and examined opportunities for improvement.MethodsWe searched PubMed, Cochrane, Embase, and Web of Science for economic evaluations of genetic screening/testing (2013-2019). Methodological rigor and adherence to best practices were systematically assessed using the British Medical Journal checklist.ResultsAcross the 47 identified studies, there were substantial variations in modeling approaches, reporting detail, and sophistication. Models ranged from simple decision trees to individual-level microsimulations that compared between 2 and >20 alternative interventions. Many studies failed to report sufficient detail to enable replication or did not justify modeling assumptions, especially for costing methods and utility values. Meta-analyses, systematic reviews, or calibration were rarely used to derive parameter estimates. Nearly all studies conducted some sensitivity analysis, and more sophisticated studies implemented probabilistic sensitivity/uncertainty analysis, threshold analysis, and value of information analysis.ConclusionWe describe a heterogeneous body of work and present recommendations and exemplar studies across the methodological domains of (1) perspective, scope, and parameter selection; (2) use of uncertainty/sensitivity analyses; and (3) reporting transparency for improvement in the economic evaluation of genetic screening/testing.  相似文献   
8.
9.
BackgroundComminuted patellar fractures are not rare, and the ideal treatment method remains controversial. The present study was conducted to evaluate effects and compare complications of two different methods used to treat comminuted patellar fractures.MethodsFrom March 2010 to August 2016, 102 cases of 34-C2 or 34-C3 comminuted patellar fractures were treated at our hospital, wherein patients received two different treatments: titanium cable tension band with cerclage method (group A) and intrafragmentary screws with X-shaped plating technique (group B). At follow-ups, articular step-off, range of motion (ROM), Lysholm scores, time of union, and complications were recorded and analyzed. Radiographic and clinical data as well as rate of complications were statistically analyzed.ResultsIn total, 87 patients were included in the final analysis (n = 47 in group A and n = 40 in group B). No significant differences were noted in terms of cost of implant, age, gender, rate of 34-C3 fractures, rate of layered inferior pole fractures, postoperative articular step-off and union time. At 2-year follow-up, average Lysholm scores, ROM and rate of complications were (89.0 ± 4.5), (122°±12°) and (27.7%) in group A and (90.2 ± 3.9), (124°±11°) and (17.5%) in group B, respectively, with no significant differences (p > 0.05). The mean time of surgery in group B was shorter than that in group A with significant difference (p < 0.05).ConclusionsTreatment using the intrafragmentary screws and plate method for amenable comminuted patellar fractures achieved similar complication rate and favorable functional outcomes at the 2-year follow-up, which was comparable to the titanium cable tension band with cerclage method. Thus, the intrafragmentary screws and plate method is effective, safe and convenient for 34-C2/C3 comminuted patellar fractures, especially appropriate for patients with layered fragments.  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