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   3033138篇
  免费   277044篇
  国内免费   13773篇
耳鼻咽喉   42972篇
儿科学   96770篇
妇产科学   76951篇
基础医学   488016篇
口腔科学   81975篇
临床医学   280572篇
内科学   523195篇
皮肤病学   89060篇
神经病学   260140篇
特种医学   120513篇
外国民族医学   100篇
外科学   486504篇
综合类   94351篇
现状与发展   92篇
一般理论   2132篇
预防医学   251880篇
眼科学   71118篇
药学   205340篇
  18篇
中国医学   9370篇
肿瘤学   142886篇
  2021年   50172篇
  2020年   37396篇
  2019年   58636篇
  2018年   73514篇
  2017年   56382篇
  2016年   62080篇
  2015年   76503篇
  2014年   113260篇
  2013年   178177篇
  2012年   83274篇
  2011年   81622篇
  2010年   118231篇
  2009年   124542篇
  2008年   68864篇
  2007年   69774篇
  2006年   81824篇
  2005年   76258篇
  2004年   78193篇
  2003年   68534篇
  2002年   58383篇
  2001年   85909篇
  2000年   77131篇
  1999年   79323篇
  1998年   58759篇
  1997年   56656篇
  1996年   53984篇
  1995年   54780篇
  1994年   48762篇
  1993年   45388篇
  1992年   54404篇
  1991年   52636篇
  1990年   49546篇
  1989年   49719篇
  1988年   45843篇
  1987年   44633篇
  1986年   42452篇
  1985年   42948篇
  1984年   40943篇
  1983年   37903篇
  1982年   38581篇
  1981年   36612篇
  1980年   34569篇
  1979年   32598篇
  1978年   30524篇
  1977年   28264篇
  1976年   25987篇
  1975年   24649篇
  1974年   24509篇
  1973年   23404篇
  1972年   21989篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
Human papillomavirus (HPV) vaccine effectiveness may differ between settings. Here we present the first real-world effectiveness study of HPV vaccination on high-grade cervical lesions from Norway, among women who received HPV vaccine outside the routine program. We performed an observational study of all Norwegian women born 1975 to 1996 and retrieved individual data from nationwide registries on HPV vaccination status and incidence of histologically verified high-grade cervical neoplasia during 2006 to 2016. We estimated the incidence rate ratio (IRR) and 95% confidence intervals (CI) for vaccination vs no vaccination by Poisson regression stratified by age at vaccination <20 years and ≥20 years. The cohort consisted of 832 732 women, of which 46 381 (5.6%) received at least one dose of HPV vaccine by the end of 2016. The incidence rate of cervical intraepithelial neoplasia grade 2 or worse (CIN2+) increased with age regardless of vaccination status and was highest at age 25 to 29, at 637/100 000 among unvaccinated women, 487/100 000 among women vaccinated before age 20 and 831/100 000 among women vaccinated at age 20 or older. The adjusted IRR of CIN2+ between vaccinated and unvaccinated women was 0.62 (95% CI: 0.46-0.84) for women vaccinated below age 20, and 1.22 (95% CI: 1.03-1.43) for women vaccinated at age 20 or older. These findings indicate that HPV vaccination among women too old to be eligible for routine HPV vaccination is effective among women who are vaccinated below age 20 but may not have the desired impact among women who are vaccinated at age 20 or older.  相似文献   
72.
During first outburst of COVID-19, several strategies had been applied for surgical oncology patients to minimize COVID-19 transmission. COVID-19 infection seemed to compromise survival and major complication rates of surgical oncology patients. However, survival, tumor progression and recurrence rates of surgical oncology patients were associated to the consequences of COVID-19 pandemic on their management. In addition, the severity of COVID-19 infections has been downgraded. Therefore, management of surgical oncology patients should be reconsidered.  相似文献   
73.
74.
75.
76.
77.

The exercise pressor reflex is a feedback mechanism engaged upon stimulation of mechano- and metabosensitive skeletal muscle afferents. Activation of these afferents elicits a reflex increase in heart rate, blood pressure, and ventilation in an intensity-dependent manner. Consequently, the exercise pressor reflex has been postulated to be one of the principal mediators of the cardiorespiratory responses to exercise. In this updated review, we will discuss classical and recent advancements in our understating of the exercise pressor reflex function in both human and animal models. Particular attention will be paid to the afferent mechanisms and pathways involved during its activation, its effects on different target organs, its potential role in the abnormal cardiovascular response to exercise in diseased states, and the impact of age and biological sex on these responses. Finally, we will highlight some unanswered questions in the literature that may inspire future investigations in the field.

  相似文献   
78.
79.
Journal of Neuro-Oncology - Craniopharyngiomas are locally-aggressive tumors arising along the hypothalamic-pituitary axis. Treatment is nuanced as a result of their proximity and adherence to...  相似文献   
80.
When hospitals first encountered coronavirus disease 2019 (COVID-19), there was a dearth of therapeutic options and nearly 1 in 3 patients died from the disease. By the summer of 2020, as deaths from the disease declined nationally, multiple single-center studies began to report declining mortality of patients with COVID-19. To evaluate the effect of COVID-19 on hospital-based mortality, we searched the Vizient Clinical Data Base for outcomes data from approximately 600 participating hospitals, including 130 academic medical centers, from January 2017 through December 2020. More than 32 million hospital admissions were included in the analysis. After an initial spike, mortality from COVID-19 declined in all regions of the country to under 10% by June 2020 and remained constant for the remainder of the year. Despite this, inpatient, all-cause mortality has increased since the beginning of the pandemic, even those without respiratory failure. Inpatient mortality has particularly increased in elderly patients and in those requiring intubation for respiratory failure. Since June 2020, COVID-19 kills one in every 10 patients admitted to the hospital with this diagnosis. The addition of this new disease has raised overall hospital mortality especially those who require intubation for respiratory failure.  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