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   4809426篇
  免费   377230篇
  国内免费   15507篇
耳鼻咽喉   67244篇
儿科学   155696篇
妇产科学   127641篇
基础医学   725876篇
口腔科学   133240篇
临床医学   441858篇
内科学   875292篇
皮肤病学   116531篇
神经病学   402549篇
特种医学   187219篇
外国民族医学   1024篇
外科学   721636篇
综合类   135000篇
现状与发展   24篇
一般理论   2802篇
预防医学   399915篇
眼科学   113001篇
药学   341826篇
  27篇
中国医学   12854篇
肿瘤学   240908篇
  2021年   56681篇
  2019年   59244篇
  2018年   75843篇
  2017年   58255篇
  2016年   64518篇
  2015年   77013篇
  2014年   111359篇
  2013年   177232篇
  2012年   137046篇
  2011年   144506篇
  2010年   130058篇
  2009年   130274篇
  2008年   130132篇
  2007年   139234篇
  2006年   147155篇
  2005年   141191篇
  2004年   142388篇
  2003年   132355篇
  2002年   121212篇
  2001年   188793篇
  2000年   184979篇
  1999年   167342篇
  1998年   74619篇
  1997年   69708篇
  1996年   67612篇
  1995年   63098篇
  1994年   57117篇
  1993年   52772篇
  1992年   122539篇
  1991年   117517篇
  1990年   113441篇
  1989年   110328篇
  1988年   101355篇
  1987年   99790篇
  1986年   93880篇
  1985年   91637篇
  1984年   74738篇
  1983年   65904篇
  1982年   50515篇
  1981年   46803篇
  1980年   43714篇
  1979年   64737篇
  1978年   51203篇
  1977年   45159篇
  1976年   41896篇
  1975年   42546篇
  1974年   47168篇
  1973年   45156篇
  1972年   42136篇
  1971年   39048篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
Introduction: Percutaneous renal mass biopsy has evolved over the last decade with improvements on previous pitfalls including low tissue yield, high non-diagnostic rates, and complications. As understanding of tumor biology and natural history of renal cortical neoplasms has improved, percutaneous renal mass biopsy is poised to have an expanding role in an area characterized by individualized management and refined risk stratification.

Areas covered: This review summarizes the evolution of renal mass biopsy to its current state with respect to outcomes, indications, and clinical guidelines.

Expert opinion: With improved understanding of differential biological potential of renal cortical neoplasms combined with technical improvements in diagnostic yield and accuracy, utilization of renal mass biopsy is becoming an important adjunct to patient care in a broad range of clinical scenarios, including active surveillance, thermal ablation, and use of primary systemic therapy in localized and advanced settings.  相似文献   

92.
93.
94.
95.
96.
97.
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR.  相似文献   
98.
We review the spectrum of cutaneous disorders associated with inflammatory and neoplastic plasmacytic pathology. Because plasma cells are derived from B‐lymphocytes our overview includes discussion of certain lymphoplasmacytic proliferations. It is structured along histopathological lines, addressing conditions characterized by (a) cutaneous plasma cell infiltrates, (b) deposits of plasma cell products or their derivatives in the skin and (c) miscellaneous, poorly understood cutaneous complications of plasmacytic disorders. Lesions arising primarily in the skin and those due to cutaneous involvement by multisystem disorders are addressed. The range includes a spectrum of tumefactive and circulatory manifestations. We highlight key clinical and pathological features of the different conditions and outline recent advances in our understanding of these entities. By emphasizing the dermatopathological characteristics of this spectrum of disorders we hope to hone the diagnostic accuracy of practitioners in the field.  相似文献   
99.
100.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  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