全文获取类型
收费全文 | 9605篇 |
免费 | 687篇 |
国内免费 | 40篇 |
专业分类
耳鼻咽喉 | 84篇 |
儿科学 | 195篇 |
妇产科学 | 295篇 |
基础医学 | 1263篇 |
口腔科学 | 323篇 |
临床医学 | 1019篇 |
内科学 | 2033篇 |
皮肤病学 | 185篇 |
神经病学 | 962篇 |
特种医学 | 795篇 |
外科学 | 1521篇 |
综合类 | 48篇 |
预防医学 | 347篇 |
眼科学 | 165篇 |
药学 | 531篇 |
中国医学 | 3篇 |
肿瘤学 | 563篇 |
出版年
2023年 | 115篇 |
2022年 | 216篇 |
2021年 | 383篇 |
2020年 | 218篇 |
2019年 | 321篇 |
2018年 | 373篇 |
2017年 | 274篇 |
2016年 | 294篇 |
2015年 | 354篇 |
2014年 | 467篇 |
2013年 | 466篇 |
2012年 | 744篇 |
2011年 | 723篇 |
2010年 | 426篇 |
2009年 | 413篇 |
2008年 | 526篇 |
2007年 | 503篇 |
2006年 | 417篇 |
2005年 | 386篇 |
2004年 | 323篇 |
2003年 | 309篇 |
2002年 | 258篇 |
2001年 | 144篇 |
2000年 | 139篇 |
1999年 | 147篇 |
1998年 | 54篇 |
1997年 | 55篇 |
1996年 | 47篇 |
1995年 | 33篇 |
1994年 | 32篇 |
1993年 | 29篇 |
1992年 | 92篇 |
1991年 | 93篇 |
1990年 | 69篇 |
1989年 | 67篇 |
1988年 | 65篇 |
1987年 | 55篇 |
1986年 | 53篇 |
1985年 | 50篇 |
1984年 | 30篇 |
1983年 | 29篇 |
1982年 | 32篇 |
1981年 | 29篇 |
1979年 | 37篇 |
1978年 | 26篇 |
1976年 | 15篇 |
1975年 | 27篇 |
1974年 | 22篇 |
1973年 | 20篇 |
1967年 | 15篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
52.
Paul M Garrett Joshua P White Simon Dennis Stephan Lewandowsky Cheng-Ta Yang Yasmina Okan Andrew Perfors Daniel R Little Anastasia Kozyreva Philipp Lorenz-Spreen Takashi Kusumi Yoshihisa Kashima 《JMIR Public Health and Surveillance》2022,8(7)
BackgroundIn response to the COVID-19 pandemic, countries are introducing digital passports that allow citizens to return to normal activities if they were previously infected with (immunity passport) or vaccinated against (vaccination passport) SARS-CoV-2. To be effective, policy decision-makers must know whether these passports will be widely accepted by the public and under what conditions. This study focuses attention on immunity passports, as these may prove useful in countries both with and without an existing COVID-19 vaccination program; however, our general findings also extend to vaccination passports.ObjectiveWe aimed to assess attitudes toward the introduction of immunity passports in six countries, and determine what social, personal, and contextual factors predicted their support.MethodsWe collected 13,678 participants through online representative sampling across six countries—Australia, Japan, Taiwan, Germany, Spain, and the United Kingdom—during April to May of the 2020 COVID-19 pandemic, and assessed attitudes and support for the introduction of immunity passports.ResultsImmunity passport support was moderate to low, being the highest in Germany (775/1507 participants, 51.43%) and the United Kingdom (759/1484, 51.15%); followed by Taiwan (2841/5989, 47.44%), Australia (963/2086, 46.16%), and Spain (693/1491, 46.48%); and was the lowest in Japan (241/1081, 22.94%). Bayesian generalized linear mixed effects modeling was used to assess predictive factors for immunity passport support across countries. International results showed neoliberal worldviews (odds ratio [OR] 1.17, 95% CI 1.13-1.22), personal concern (OR 1.07, 95% CI 1.00-1.16), perceived virus severity (OR 1.07, 95% CI 1.01-1.14), the fairness of immunity passports (OR 2.51, 95% CI 2.36-2.66), liking immunity passports (OR 2.77, 95% CI 2.61-2.94), and a willingness to become infected to gain an immunity passport (OR 1.6, 95% CI 1.51-1.68) were all predictive factors of immunity passport support. By contrast, gender (woman; OR 0.9, 95% CI 0.82-0.98), immunity passport concern (OR 0.61, 95% CI 0.57-0.65), and risk of harm to society (OR 0.71, 95% CI 0.67-0.76) predicted a decrease in support for immunity passports. Minor differences in predictive factors were found between countries and results were modeled separately to provide national accounts of these data.ConclusionsOur research suggests that support for immunity passports is predicted by the personal benefits and societal risks they confer. These findings generalized across six countries and may also prove informative for the introduction of vaccination passports, helping policymakers to introduce effective COVID-19 passport policies in these six countries and around the world. 相似文献
53.
Both malignant and benign lesions may be found on the base of the tongue, including metastasis from other sites. Various surgical approaches to the base of tongue have been described. Here, we report a case of a 26-year-old woman with a schwannoma in the base of tongue removed through a suprahyoid pharyngotomy approach. The biology and pathology of schwannoma in the oral cavity are discussed. The advantage of the suprahyoid pharyngotomy approach for complete excision of a mass in the base of tongue is demonstrated. 相似文献
54.
The differentiation between a chronic cryptococcal meningitis and a chronic tuberculous meningitis may cause problems for the clinician only if standard microbiological methods are not applied to the diagnosis of both infections. In a male non-AIDS patient (50 y), 11 years after a suggested diagnosis of "tuberculous meningitis", meningoencephalitis with hydrocephalus was diagnosed and treated accordingly without success. Mycobacterium tuberculosis was never found. Because fibrin fibres of a spider web coagulum in the CSF resembled Aspergillus mycelium, the patient was then treated with amphotericin B + flucytosine. Finally, a mycological examination led to the true diagnosis: (1) In the CSF, resembling Aspergillus hyphae were found to be spider web coagulum fibres. (2) Cryptococcal meningoencephalitis based on the detection of Cryptococcus neoformans in CSF and its antigen in serum and CSF. - At post-mortem, cryptococcal meningoencephalitis was established as cause of death. Residual signs of tuberculosis could not be detected in the brain and the meninges. Common clinical similarities of cryptococcal and tuberculous meningitis and the possibility of a double infection are discussed. A comparison of the presence of Cr. neoformans in the meninges of non-AIDS and AIDS patients is made. The formation of spider web coagulum in the CSF is discussed. Proposals for the diagnosis, therapy and prophylaxis of cryptococcal meningitis are made. 相似文献
55.
56.
A. Simons Fritz Händel Langendorff Josef Frank F. Eillinger Happel Zwerg Fried Walter Schaefer Hedfeld E. Philipp Wehefritz Englmann 《Journal of cancer research and clinical oncology》1932,36(5-6):125-128
Ohne Zusammenfassung 相似文献
57.
E. Philipp H. J. Arndt I. Costero Erich Müller C. Kaufmann 《Journal of cancer research and clinical oncology》1931,34(5):174-177
Ohne Zusammenfassung 相似文献
58.
Wachsmuth Melchior W. V. Simon Oberniedermayr R. Hirschfeld Valentin Gerbis Ernst Philipp 《Journal of molecular medicine (Berlin, Germany)》1932,11(8):341-342
Ohne Zusammenfassung 相似文献
59.
Gabija Krutkyte Leyla Wenk Jonas Odermatt Philipp Schuetz Zeno Stanga Natalie Friedli 《Nutrients》2022,14(14)
Malnutrition is one of the most frequent metabolic challenges in the population of chronically ill patients. This results in increased administration of nutritional therapy in inpatient settings, which poses the risk of side effects, in particular, the development of refeeding syndrome. If not managed accordingly, it leads to a significant rise in morbidity and mortality. However, despite its importance, evidence-based recommendations on the management of refeeding syndrome are largely lacking, and only a few randomized controlled trials have been conducted. In light of this, the aim of this review is to raise awareness of refeeding syndrome in chronically ill patients by critically reviewing recent literature and providing a short overview as well as diagnosis and treatment algorithms of this underreported metabolic condition. In summary, recent findings suggest undergoing risk assessment and stratification for every patient receiving nutritional therapy. According to this, adaptation of energy and fluid support during the replenishment phase should be implemented in the nutritional therapy for patients at high risk. Additionally, continuous monitoring should take place, and appropriate actions should be initiated when necessary. 相似文献
60.
Heather Fraser Winfrida TombeMdewa Ciaran KohliLynch Karen Hofman Stefano Tempia Meredith McMorrow Philipp Lambach Wayne Ramkrishna Cheryl Cohen Raymond Hutubessy Ijeoma Edoka 《Influenza and other respiratory viruses》2022,16(5):873
BackgroundInfluenza accounts for a substantial number of deaths and hospitalisations annually in South Africa. To address this disease burden, the South African National Department of Health introduced a trivalent inactivated influenza vaccination programme in 2010.MethodsWe adapted and populated the WHO Seasonal Influenza Immunization Costing Tool (WHO SIICT) with country‐specific data to estimate the cost of the influenza vaccination programme in South Africa. Data were obtained through key‐informant interviews at different levels of the health system and through a review of existing secondary data sources. Costs were estimated from a public provider perspective and expressed in 2018 prices. We conducted scenario analyses to assess the impact of different levels of programme expansion and the use of quadrivalent vaccines on total programme costs.ResultsTotal financial and economic costs were estimated at approximately USD 2.93 million and USD 7.91 million, respectively, while financial and economic cost per person immunised was estimated at USD 3.29 and USD 8.88, respectively. Expanding the programme by 5% and 10% increased economic cost per person immunised to USD 9.36 and USD 9.52 in the two scenarios, respectively. Finally, replacing trivalent inactivated influenza vaccine (TIV) with quadrivalent vaccine increased financial and economic costs to USD 4.89 and USD 10.48 per person immunised, respectively.ConclusionWe adapted the WHO SIICT and provide estimates of the total costs of the seasonal influenza vaccination programme in South Africa. These estimates provide a basis for planning future programme expansion and may serve as inputs for cost‐effectiveness analyses of seasonal influenza vaccination programmes. 相似文献