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   12527篇
  免费   755篇
  国内免费   20篇
耳鼻咽喉   110篇
儿科学   583篇
妇产科学   262篇
基础医学   1733篇
口腔科学   168篇
临床医学   979篇
内科学   2640篇
皮肤病学   269篇
神经病学   1310篇
特种医学   477篇
外国民族医学   4篇
外科学   2033篇
综合类   151篇
一般理论   3篇
预防医学   786篇
眼科学   160篇
药学   665篇
中国医学   12篇
肿瘤学   957篇
  2021年   165篇
  2020年   102篇
  2019年   153篇
  2018年   196篇
  2017年   152篇
  2016年   155篇
  2015年   193篇
  2014年   253篇
  2013年   325篇
  2012年   561篇
  2011年   611篇
  2010年   363篇
  2009年   330篇
  2008年   514篇
  2007年   519篇
  2006年   545篇
  2005年   622篇
  2004年   489篇
  2003年   470篇
  2002年   489篇
  2001年   425篇
  2000年   470篇
  1999年   363篇
  1998年   161篇
  1997年   128篇
  1996年   132篇
  1995年   119篇
  1994年   127篇
  1993年   110篇
  1992年   288篇
  1991年   261篇
  1990年   252篇
  1989年   280篇
  1988年   247篇
  1987年   246篇
  1986年   215篇
  1985年   224篇
  1984年   187篇
  1983年   157篇
  1982年   105篇
  1981年   103篇
  1980年   67篇
  1979年   153篇
  1978年   108篇
  1977年   72篇
  1976年   78篇
  1975年   73篇
  1974年   105篇
  1973年   95篇
  1972年   71篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
1.
2.
Background The rate of preterm births in Germany is 8.6%, which is very high compared to other European countries. As preterm birth contributes significantly to perinatal morbidity and mortality rates, the existing prevention strategies need to be optimized and expanded further. About ⅔ of all women with preterm birth have preterm labor or premature rupture of membranes. They are bracketed together under the term “spontaneous preterm birth” as opposed to iatrogenic preterm birth, for example as a consequence of preeclampsia or fetal growth retardation. Recent studies suggest that low-dose aspirin does not just reduce the rate of iatrogenic preterm births but can also further reduce the rate of spontaneous preterm births. This review article presents the current state of knowledge. Method A selective literature search up until April 2020 was done in PubMed, using the terms “randomized trial”, “randomized study”, “spontaneous preterm birth”, and “aspirin”. Results Secondary analyses of prospective randomized studies on the prevention of preeclampsia with low-dose aspirin show that this intervention also significantly reduced the rate of spontaneous preterm births in both high-risk and low-risk patient populations. The results of the ASPIRIN trial, a prospective, randomized, double-blinded multicenter study carried out in six developing countries, also point in this direction, with the figures showing that the daily administration of 81 mg aspirin starting before 14 weeks of gestation lowered the preterm birth rate of nulliparous women without prior medical conditions by around 11% (11.6 vs. 13.1%; RR 0.89; 95% CI: 0.81 – 0.98, p = 0.012). Conclusion Further studies on this issue are urgently needed. If these confirm the currently available results, then it would be worth discussing whether general aspirin prophylaxis for all pregnant women starting at the latest in 12 weeks of gestation is indicated. Key words: spontaneous preterm birth, iatrogenic preterm birth, prevention, preeclampsia, aspirin  相似文献   
3.
BackgroundPenile prosthesis surgery has witnessed a migration from the inpatient to ambulatory surgical care setting. However, little is known about the cost savings afforded by this change in care setting and whether or not these savings come at the expense of worse perioperative outcomes.AimThe aim of this study was to identify predictors of index penile prosthesis (PP) surgery care setting, and whether ambulatory vs inpatient surgery is associated with comparable perioperative outcomes and costs.MethodsThis was a retrospective cohort study using all-payer claims data from the 2014 Healthcare Cost and Utilization Project State Databases from Florida and New York. Patient demographics, regional data, total charges (converted to costs), and 30-day revisit rates were abstracted for all patients undergoing index placement of an inflatable or malleable PP. Multivariable logistic and linear regression adjusted for facility clustering was utilized.OutcomesThe outcomes were index surgical and 30-day postoperative costs, as well as 30-day revisit rates.ResultsOf the 1,790 patients undergoing an index surgery, 394 (22.0%) received care in the inpatient setting compared to 1,396 (78.0%) in the ambulatory setting. Adjusted index procedural ($9,319.66 vs $ 10,191.35; P < .001) and 30-day acute care costs ($9,461.74 vs $10,159.42; P < .001) were lower in the ambulatory setting. The underinsured experienced lower odds of receiving surgery in the ambulatory setting (Medicaid vs private: odds ratio [OR] 0.19; 95% CI 0.06?0.55; P < .001). There was no difference in risk-adjusted odds of experiencing a 30-day revisit between patients undergoing surgery in the ambulatory vs inpatient settings (OR 1.31; 95% CI 0.78?2.21; P = .3).Clinical TranslationAmbulatory PP surgery confers significant cost savings and is associated with comparable perioperative outcomes relative to inpatient-based surgery.ConclusionsBoth clinical and nonclinical factors predict the care setting of index PP surgery. Notably, underinsured patients experienced lower odds of undergoing ambulatory surgery. Ambulatory surgery was less costly with similar 30-day revisit rates relative to inpatient-based care.Berger A, Friedlander DF, Herzog P, et al. Impact of Index Surgical Care Setting on Perioperative Outcomes and Cost Following Penile Prosthesis Surgery. J Sex Med 2019;16:1451–1458.  相似文献   
4.
5.
6.
7.
Berger  R.  Abele  H.  Garnier  Y.  Kuon  R.  Rath  W.  Maul  H. 《Der Gyn?kologe》2020,53(5):331-337
Die Gynäkologie - Die Frühgeburt trägt wesentlich zur perinatalen Morbidität und Mortalität bei und gilt als einer der Hauptrisikofaktoren für...  相似文献   
8.
9.
The recent outbreak of Zika virus (ZIKV) in Brazil and other countries globally demonstrated the relevance of ZIKV studies. During and after this outbreak, there was an intense increase in scientific production on ZIKV infections, especially toward alterations promoted by the infection and related to clinical outcomes. Considering this massive amount of new data, mainly thousands of genes and proteins whose expression is impacted by ZIKV infection, the ZIKA Virus Infection Database (ZIKAVID) was created. ZIKAVID is an online database that comprises all genes or proteins, and associated information, for which expression was experimentally measured and found to be altered after ZIKV infection. The database, available at https://zikavid.org, contains 16,984 entries of gene expression measurements from a total of 7348 genes. It allows users to easily perform searches for different experimental hosts (cell lines, tissues, and animal models), ZIKV strains (African, Asian, and Brazilian), and target molecules (messenger RNA [mRNA] and protein), among others, used in differential expression studies regarding ZIKV infection. In this way, the ZIKAVID will serve as an additional and important resource to improve the characterization of the molecular impact and pathogenesis associated with ZIKV infection.  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