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   1034806篇
  免费   72304篇
  国内免费   1959篇
耳鼻咽喉   13984篇
儿科学   27668篇
妇产科学   25596篇
基础医学   147537篇
口腔科学   32100篇
临床医学   90019篇
内科学   206424篇
皮肤病学   21861篇
神经病学   82302篇
特种医学   39184篇
外国民族医学   80篇
外科学   161190篇
综合类   18414篇
现状与发展   1篇
一般理论   282篇
预防医学   72045篇
眼科学   22988篇
药学   79706篇
  28篇
中国医学   2567篇
肿瘤学   65093篇
  2021年   9305篇
  2019年   8866篇
  2018年   12285篇
  2017年   9543篇
  2016年   10724篇
  2015年   12138篇
  2014年   16295篇
  2013年   23114篇
  2012年   32562篇
  2011年   33872篇
  2010年   19634篇
  2009年   18321篇
  2008年   31630篇
  2007年   32743篇
  2006年   32941篇
  2005年   31426篇
  2004年   29970篇
  2003年   28435篇
  2002年   27488篇
  2001年   55225篇
  2000年   56882篇
  1999年   47505篇
  1998年   11477篇
  1997年   10085篇
  1996年   10117篇
  1995年   9348篇
  1994年   8681篇
  1993年   7927篇
  1992年   35761篇
  1991年   34093篇
  1990年   32920篇
  1989年   32037篇
  1988年   29156篇
  1987年   28384篇
  1986年   26438篇
  1985年   25251篇
  1984年   17958篇
  1983年   15260篇
  1982年   7943篇
  1979年   15848篇
  1978年   10672篇
  1977年   9117篇
  1976年   7928篇
  1975年   8672篇
  1974年   10514篇
  1973年   9886篇
  1972年   9382篇
  1971年   8870篇
  1970年   8445篇
  1969年   7941篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
Background and objective: Global Influenza Hospital Surveillance Network is a worldwide initiative that aims to document the burden of influenza infections among acute admissions and vaccine effectiveness in particular countries. As a partner of this platform, we aimed to determine the frequency of influenza infections among acute admissions with influenza-like illness and the outcomes of enrolled patients during the 2015–2016 influenza season in selected hospitals in Turkey.

Patients and methods: The investigators screened the hospital admission registries, chart review or available records, and screened all patients hospitalized in the previous 24–48?hours or overnight in the predefined wards or emergency room. A total of 1351 patients were screened for enrollment in five tertiary care referral hospitals in Ankara and 774 patients (57.3% of the initial screened population) were eligible for swabbing. All of the eligible patients who consented were swabbed and tested for influenza with real-time polymerase chain reaction (PCR) based methods.

Results: Overall, influenza positivity was detected in 142 patients (18.4%). The predominant influenza strain was A H1N1pdm09. Outcomes were worse among elderly patients, regardless of the presence of the influenza virus. Half of the patients over 65 years of age were admitted to the intensive care unit, while one third required any mode of mechanical ventilation and one fourth died in the hospital in that particular episode.

Conclusion: These findings can guide hospitals to plan and prepare for the influenza season. Effective influenza vaccination strategies, particularly aimed at the elderly and adults with chronic diseases, can provide an opportunity for prevention of deaths due to influenza-like illness.  相似文献   
72.
73.
74.
75.
76.
77.

Background

A large number of studies have reported the high prevalence of problematic internet use (PIU) among adolescents and students (13-50%)1, and PIU has been associated with many psychiatric symptoms2. In contrast, only a few studies have investigated its prevalence among the adult population. To the best of our knowledge, there have been no studies investigating the prevalence and comorbidity of PIU in a psychiatric population although psychiatric symptoms might either induce PIU in patients with psychiatric illnesses, or PIU might induce or aggravate psychiatric symptoms. The aims of this study are to investigate the prevalence of PIU and psychiatric co-morbidity among adult psychiatric patients.

Methods

Three hundred thirty-three adult psychiatric patients with internet access were recruited at the outpatient clinic of psychiatry at the University Hospital, Kyoto Prefectural University of Medicine over a three-month period. Two hundred thirty-one of them completed the survey (response rate: 69.4%; Male/Female/Transgender: 90/139/2; mean age = 42.2). We divided participants into “normal internet users” and “problematic internet users” using a combination of Young’s Internet Addiction Test (IAT) and the Compulsive Internet Use Scale (CIUS), using established cut-off values. Demographic data and comorbid psychiatric symptoms were compared between the two groups, using self-rating scales measuring insomnia (Athens Insomnia Scale, AIS), depression (Beck Depression Inventory, BDI), anxiety (State-trait Anxiety Inventory, STAI), attention deficit hyperactivity disorder (ADHD) (Adult ADHD Self-report Scale, ASRS), autism (Autism Spectrum Quotient, AQ), obsessive-compulsive disorder (OCD) (Obsessive-Compulsive Inventory, OCI), social anxiety disorder (SAD) (Liebowitz Social Anxiety Scale, LSAS), alcohol abuse, and impulsivity (Barratt Impulsive Scale, BIS).

Results

Of our 231 respondents, 58 (25.1%) were defined as problematic internet users, as they scored high on either the IAT (40 or more) or CIUS (21 or more). The age of problematic internet users was significantly lower than that of normal internet users (35.9 vs 43.6, p<0.001, Mann-Whitney U test). The problematic internet users scored significantly higher on scales measuring sleep problems (AIS, 8.8 for problematic internet users vs 6.3 for normal internet users, p<0.001), depression (BDI, 27.4 vs 18.3, p<0.001), trait anxiety (STAI, 61.8 vs 53.9, p<0.001), ADHD (ASRS, part A 3.1 vs 1.8 and part B 3.5 vs 1.8, p<0.001), autism (AQ, 25.9 vs 21.6, p<0.001), OCD (OCI, 63.2 vs 36.3, p<0.001), SAD (LSAS, 71.4 vs 54.0, p<0.001), and impulsivity (BIS, 67.4 vs 63.5, p=0.004).

Conclusions

The prevalence of PIU among adult psychiatric patients is relatively high (25%). As previous studies reported in the general population, PIU among adult psychiatric patients was associated with lower age and higher psychiatric comorbidity. Longitudinal research is needed to determine any causal relations between problematic internet use and psychopathological illnesses.  相似文献   
78.
79.
Little is known about the development of psychosis during hydroxychloroquine (HCQ) treatment, especially in elderly patients affected by rheumatic diseases, with multiple comorbidities and treatments. To summarize the available evidence on HCQ-induced psychosis in elders, we performed a literature review. Additionally, individual case safety reports sent to the European Pharmacovigilance database (EudraVigilance) with HCQ as suspected drug and related to adverse events belonging to the System Organ Class ‘Psychiatric disorders’ were shown. Over the years, evidence was published about the risk of neuropsychiatric clinical manifestations during HCQ treatment for rheumatic diseases, but few of them were related to elderly patients. These adverse events can include less severe clinical manifestations such as affect lability and nervousness or more severe conditions such as actual psychosis and suicidal tendencies, which frequency are actually unknown. The presence of risk factors in these patients may precipitate HCQ-induced psychosis and their precocious detection could be associated with a risk minimization. Among predisposing risk factors, there are the co-exposure to interacting drugs, alcohol intake, familial history of psychiatric diseases, female gender, and the concomitant use of low-dose glucocorticoids. In some cases it was possible to reverse psychotic behaviour with the antipsychotic treatment or with HCQ suspension.  相似文献   
80.
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