全文获取类型
收费全文 | 4491篇 |
免费 | 333篇 |
国内免费 | 37篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 222篇 |
妇产科学 | 53篇 |
基础医学 | 647篇 |
口腔科学 | 24篇 |
临床医学 | 304篇 |
内科学 | 800篇 |
皮肤病学 | 55篇 |
神经病学 | 64篇 |
特种医学 | 13篇 |
外科学 | 145篇 |
综合类 | 173篇 |
现状与发展 | 1篇 |
一般理论 | 1篇 |
预防医学 | 1916篇 |
眼科学 | 15篇 |
药学 | 185篇 |
2篇 | |
中国医学 | 3篇 |
肿瘤学 | 231篇 |
出版年
2024年 | 7篇 |
2023年 | 221篇 |
2022年 | 198篇 |
2021年 | 343篇 |
2020年 | 222篇 |
2019年 | 224篇 |
2018年 | 226篇 |
2017年 | 184篇 |
2016年 | 205篇 |
2015年 | 201篇 |
2014年 | 271篇 |
2013年 | 337篇 |
2012年 | 225篇 |
2011年 | 240篇 |
2010年 | 212篇 |
2009年 | 209篇 |
2008年 | 154篇 |
2007年 | 153篇 |
2006年 | 110篇 |
2005年 | 118篇 |
2004年 | 120篇 |
2003年 | 86篇 |
2002年 | 84篇 |
2001年 | 77篇 |
2000年 | 69篇 |
1999年 | 49篇 |
1998年 | 34篇 |
1997年 | 35篇 |
1996年 | 38篇 |
1995年 | 20篇 |
1994年 | 25篇 |
1993年 | 17篇 |
1992年 | 21篇 |
1991年 | 14篇 |
1990年 | 9篇 |
1989年 | 14篇 |
1988年 | 11篇 |
1987年 | 10篇 |
1986年 | 14篇 |
1985年 | 12篇 |
1984年 | 9篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1972年 | 2篇 |
排序方式: 共有4861条查询结果,搜索用时 909 毫秒
81.
《Public Health Forum》2014,22(3):23.e1-23.e3
Every year influenza infections leads to hospitalizations, deaths and days missed from work and school. However, influenza is a vaccine-preventable disease. Measures to improve vaccination rates among risk groups and healthcare personnel ought to be an important public health goal. 相似文献
83.
84.
85.
《Vaccine》2021,39(24):3287-3295
BackgroundIn August 2015, the German Standing Committee on Vaccination (STIKO) changed the pneumococcal conjugate vaccination (PCV) schedule for mature infants from a 3+1 scheme to a 2+1 scheme. It was expected that a reduction of doses would be associated with a higher acceptance of the vaccination. Aim of this study was to assess vaccination rates and adherence for PCV after the change of recommendation based on real-world data.MethodsA retrospective claims data analysis using the InGef Research Database was conducted. The study population consisted of all mature infants born in 2013 (last birth cohort completely under 3+1 recommendation) or 2016 (first birth cohort completely under 2+1 recommendation) with an individual follow-up of 24 months. Hexavalent combination vaccination (HEXA) with a consistent 3+1 recommendation was analyzed as reference.ResultsAfter follow-up of 24 months, 90.9% (91.2%) of the 2016 (2013) cohort received at least one dose of PCV. At the same age, 67.7% of the 2013 cohort received a booster dose according to the 3+1 schedule and 75.6% of the 2016 cohort received a booster dose presumably either according to the 2+1 (71.7%) or 3+1 (3.9%) schedule. Of those receiving the booster dose, only 46.3% (2016) and 45.1% (2013) received the booster dose on time as recommended. The HEXA vaccination rate increased from 88.9% (2013) to 91.6% (2016) with a full series completion in 69.1% (2013) vs 72.9% (2016). The proportion of infants receiving the booster vaccination on time rose to 50.0% in 2016 (47.8% in 2013).ConclusionsAlthough the rate for the PCV booster dose slightly increased, nearly a quarter of the infants born in 2016 did not receive a booster dose at all. Furthermore, vaccinations were still frequently delayed, and the rate of unvaccinated infants remained constant. 相似文献
86.
《Vaccine》2021,39(42):6283-6290
BackgroundChildren around the world remain under-vaccinated for many reasons. To develop effective vaccine delivery programmes and monitor intervention impact, vaccine programme implementers need to understand reasons for under-vaccination within their local context. The World Health Organization (WHO) Working Group on the Behavioural and Social Drivers of Vaccination (BeSD) is developing standardised tools for assessing childhood vaccine acceptance and uptake that can be used across regions and countries. The tools will include: (1) a validated survey; (2) qualitative interview guides; and (3) corresponding user guidance. We report a user-centred needs assessment of key end-users of the BeSD tools.MethodsTwenty qualitative interviews (Apr-Aug 2019) with purposively sampled vaccine programme managers, partners and stakeholders from UNICEF and WHO country and regional offices. The interviews assessed current systems, practices and challenges in data utilisation and reflections on how the BeSD tools might be optimised. Framework analysis was used to code the interviews.ResultsRegarding current practices, participants described a variety of settings, data systems, and frequencies of vaccination attitude measurement. They reported that the majority of data used is quantitative, and there is appetite for increased use of qualitative data. Capacity for conducting studies on social/behavioural drivers of vaccination was high in some jurisdictions and needed in others. Issues include barriers to collecting such data and variability in sources. Reflecting on the tools, participants described the need to explore the attitudes and practices of healthcare workers in addition to parents and caregivers. Participants were supportive of the proposed mixed-methods structure of the tools and training in their usage, and highlighted the need for balance between tool standardisation and flexibility to adapt locally.ConclusionsA user-centred approach in developing the BeSD tools has given valuable direction to their design, bringing the use of behavioural and social data to the heart of programme planning. 相似文献
87.
《Expert opinion on investigational drugs》2013,22(12):1523-1535
Being highly pathogenic for human and nonhuman primates and the subject of former weapon programmes makes Ebola virus one of the most feared pathogens worldwide today. Due to a lack of licensed pre- and postexposure intervention, the current response depends on rapid diagnostics, proper isolation procedures and supportive care of case patients. Consequently, the development of more specific countermeasures is of high priority for the preparedness of many nations. Over the past years, enhanced research efforts directed to better understand virus replication and pathogenesis have identified potential new targets for intervention strategies. The authors discuss the most promising therapeutic approaches for Ebola haemorrhagic fever as judged by their efficacy in animal models. The current development in this field encourages discussions on how to move some of the experimental approaches towards clinical application. 相似文献
88.
目的探讨儿童监护人以及从事儿童预防接种工作的护士对儿童预防接种服务中优质服务的认知情况。方法采用自行设计的认知调查问卷对100名护士及200名儿童监护人进行调查。结果护士和儿童监护人在对关爱沟通、服务态度及监护人感受的认知上差异存在统计学意义(P<0.01),而在技术能力及健康教育的比较中,差异无统计学意义(P>0.05)。结论从事儿童预防工作的护士及儿童监护人对儿童预防接种服务中优质服务的认知有共同的观点,也有各自独特的见解。 相似文献
89.
《Vaccine》2021,39(51):7387-7393
BackgroundIn 2015, the German Standing Committee on Vaccination (STIKO) changed the pneumococcal conjugate vaccination (PCV) schedule for mature infants from a 3+1 scheme (2, 3, 4, and 11–14 months of age) to a 2+1 scheme (2, 4, and 11–14 months of age). For premature infants, the 3+1 scheme remained. The aim of this study was to assess vaccination rates, completeness, and timeliness for PCV in premature infants before and after the modified recommendation.MethodsA retrospective claims data analysis using the “Institut für angewandte Gesundheitsforschung Berlin” Research Database was conducted. Premature infants born in 2013 and 2016 with an individual follow-up of 24 months were included. Hexavalent combination (HEXA) vaccination with a consistent 3+1 recommendation for mature and premature infants was analyzed as reference vaccination.ResultsAfter 24 months, the PCV rate for at least one dose remained stable in premature newborns of 2016 compared to 2013, while the HEXA vaccination rate increased slightly. However, a significant decrease of a completed PCV schedule (4 doses) in premature infants was noted, whereas the completeness of HEXA vaccination did not change. The timeliness of PCV in premature newborns increased for the first and the booster PCV, while the timeliness of HEXA immunization did not change from 2013 to 2016.ConclusionAlthough STIKO still recommends a 3+1 PCV schedule for premature infants in Germany, premature infants were vaccinated according to the changed recommendations for mature born infants. A substantial share of premature infants remained unvaccinated, and their vaccinations were often delayed. 相似文献
90.