全文获取类型
收费全文 | 20479篇 |
免费 | 1118篇 |
国内免费 | 184篇 |
专业分类
耳鼻咽喉 | 91篇 |
儿科学 | 305篇 |
妇产科学 | 257篇 |
基础医学 | 2799篇 |
口腔科学 | 712篇 |
临床医学 | 2885篇 |
内科学 | 1937篇 |
皮肤病学 | 307篇 |
神经病学 | 798篇 |
特种医学 | 256篇 |
外科学 | 1386篇 |
综合类 | 4073篇 |
一般理论 | 2篇 |
预防医学 | 4027篇 |
眼科学 | 204篇 |
药学 | 1227篇 |
129篇 | |
中国医学 | 264篇 |
肿瘤学 | 122篇 |
出版年
2023年 | 337篇 |
2022年 | 424篇 |
2021年 | 664篇 |
2020年 | 661篇 |
2019年 | 1253篇 |
2018年 | 1080篇 |
2017年 | 831篇 |
2016年 | 599篇 |
2015年 | 479篇 |
2014年 | 1305篇 |
2013年 | 1388篇 |
2012年 | 1384篇 |
2011年 | 1356篇 |
2010年 | 1083篇 |
2009年 | 1036篇 |
2008年 | 1042篇 |
2007年 | 1093篇 |
2006年 | 835篇 |
2005年 | 532篇 |
2004年 | 407篇 |
2003年 | 295篇 |
2002年 | 228篇 |
2001年 | 172篇 |
2000年 | 148篇 |
1999年 | 100篇 |
1998年 | 80篇 |
1997年 | 70篇 |
1996年 | 65篇 |
1995年 | 69篇 |
1994年 | 55篇 |
1993年 | 40篇 |
1992年 | 45篇 |
1991年 | 40篇 |
1990年 | 34篇 |
1989年 | 31篇 |
1988年 | 33篇 |
1987年 | 23篇 |
1985年 | 176篇 |
1984年 | 300篇 |
1983年 | 230篇 |
1982年 | 251篇 |
1981年 | 240篇 |
1980年 | 214篇 |
1979年 | 214篇 |
1978年 | 161篇 |
1977年 | 123篇 |
1976年 | 159篇 |
1975年 | 144篇 |
1974年 | 129篇 |
1973年 | 104篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
《Vaccine》2022,40(7):1001-1009
Vaccination guidelines for dogs and cats indicate that core vaccines (for dogs, rabies, distemper, adenovirus, parvovirus; for cats, feline parvovirus, herpes virus-1, calicivirus) are essential to maintain health, and that non-core vaccines be administered according to a clinician’s assessment of a pet’s risk of exposure and susceptibility to infection. A reliance on individual risk assessment introduces the potential for between-practice inconsistencies in non-core vaccine recommendations. A study was initiated to determine non-core vaccination rates of dogs (Leptospira, Borrelia burgdorferi, Bordetella bronchiseptica, canine influenza virus) and cats (feline leukemia virus) in patients current for core vaccines in veterinary practices across the United States. Transactional data for 5,531,866 dogs (1,670 practices) and 1,914,373 cats (1,661 practices) were retrieved from practice management systems for the period November 1, 2016 through January 1, 2020, deidentified and normalized. Non-core vaccination status was evaluated in 2,798,875 dogs and 788,772 cats that were core-vaccine current. Nationally, median clinic vaccination rates for dogs were highest for leptospirosis (70.5%) and B. bronchiseptica (68.7%), and much lower for canine influenza (4.8%). In Lyme-endemic states, the median clinic borreliosis vaccination rate was 51.8%. Feline leukemia median clinic vaccination rates were low for adult cats (34.6%) and for kittens and 1-year old cats (36.8%). Individual clinic vaccination rates ranged from 0 to 100% for leptospirosis, B. bronchiseptica and feline leukemia, 0–96% for canine influenza, and 0–94% for borreliosis. Wide variation in non-core vaccination rates between clinics in similar geographies indicates that factors other than disease risk are driving the use of non-core vaccines in pet dogs and cats, highlighting a need for veterinary practices to address gaps in patient protection. Failure to implement effective non-core vaccination strategies leaves susceptible dogs and cats unprotected against vaccine-preventable diseases. 相似文献
2.
目的:了解实习护生情绪智力、临床实习环境与病人安全感知能力现状并探讨三者关系。方法:采用情绪智力量表、临床实习环境量表和卫生职业教育病人安全感知量表对492名实习护生进行调查。结果:实习护生情绪智力总分为(123.81±18.69)分,临床实习环境总分为(119.48±22.16)分,病人安全感知能力总分为(67.16±12.06)分,情绪智力、临床实习环境与病人安全感知能力呈正相关(r值分别为0.723和0.720,P<0.01);情绪智力在临床实习环境和病人安全感知能力间起部分中介效应,中介效应估计值为0.286(28.6%)。结论:学校要举办人文课程活动以培养情绪智力;医院应制订计划增加学习机会,选拔给予护生充分支持的带教老师,改善临床实习环境。 相似文献
3.
4.
5.
《Journal of pediatric surgery》2023,58(9):1613-1617
BackgroundThe goal of this study was to characterize contemporary performance benchmarks and risk factors associated with negative appendectomy (NA) in children with suspected appendicitis.MethodsA multicenter retrospective cohort analysis of children undergoing appendectomy for suspected appendicitis was performed using data from the 2016–2021 NSQIP-Pediatric Appendectomy Targeted Public Use Files. Multivariable regression was used to evaluate the influence of year, age, sex, and WBC count on NA rate, and to generate rate estimates for NA based on different combinations of demographic characteristics and WBC profiles.Results100,322 patients were included from 140 hospitals. The overall NA rate was 2.4%, and rates decreased significantly during the study period (2016: 3.1% vs. 2021: 2.3%, p < 0.001). In adjusted analyses, the highest risk for NA was associated with a normal WBC (<9000/mm3; OR 5.31 [95% CI: 4.87–5.80]), followed by female sex (OR 1.55 [95% CI: 1.42–1.68]) and age <5 years (OR 1.64 [95% CI 1.39, 1.94]). Model-estimated risk for NA varied significantly across demographic and WBC strata, with a 14.4-fold range in rates between subgroups with the lowest and highest predicted risk (males 13–17 years with elevated WBC [1.1%] vs. females 3–4 years with normal WBC [15.8%]).ConclusionsContemporary NA rates have decreased over time, however NA risk remains high in children without a leukocytosis, particularly for girls and children <5 years of age. These data provide contemporary performance benchmarks for NA in children with suspected appendicitis and identify high-risk populations where further efforts to mitigate NA risk should be targeted.Level of EvidenceIII. 相似文献
6.
Discrimination towards individuals with disabilities is problematic within nursing. There have been calls to increase diversity in nursing and this includes embracing nurses with disabilities. Increasing diversity in nursing requires increasing diversity among nursing students; in this way, nurse educators are gatekeepers to the profession. Clinical education is a crucial element of nursing education, yet there have been very few studies related to the clinical education of nursing students with disabilities. There have been no studies of attitudes of acute care nurse preceptors toward students with disabilities in the United States. This gap is important as the majority of clinical experiences occur in the acute care environment. Utilizing a focused ethnography, semi-structured interviews were conducted with 20 acute care nurses with at least two years’ experience precepting students. While positive feelings about nursing students with disabilities were shared, thoughts and behavioral intentions remained negative. Six themes emerged: safety, barriers, otherness, communicating to meet needs, disclosure, and student versus colleague. Attitudinal barriers are the primary barriers faced by individuals with disabilities in becoming and practicing as nurses. Nurses in practice and education must embrace more inclusive attitudes towards individuals with disabilities. 相似文献
7.
8.
目的了解发达国家医学生器官捐献意愿研究的目的、结果、障碍因素和解决对策。 方法以主题词和自由词联合的方式对PubMed、Web of Science、Ovid MEDLINE、Ovid EMBASE(Excerpta Medica)、EBSCOhost Complete和Cochrane Library等已发表文献数据库,以及灰色文献数据库York Centre for Reviews and Dissemination、Open Grey、ProQuest Dissertation and Theses和Mednar进行系统、全面地检索,并采用Arksey和O′Malley提出的范围综述框架进行文献资料整合。 结果共纳入17项发达国家医学生器官捐献意愿研究。研究背景主要为医学生未来对于公众器官捐献有着重要影响。研究结果表明,大多数医学生器官捐献意愿性良好,但不同亚组的研究结果不一;其最主要的障碍因素为医学生器官捐献相关知识的缺乏;解决对策主要为施予系统化、结构化和可评价的教育课程。 结论21世纪以来发达国家医学生器官捐献意愿研究方兴未艾,其研究的多层面、多角度以及揭示的问题、寻求的解决对策,可对我国现阶段医学生器官捐献的研究提供一定参考。 相似文献
9.
《The Annals of thoracic surgery》2023,115(1):88-95
BackgroundRecent guidelines for the treatment of moderate or severe ischemic mitral regurgitation (IMR) in patients undergoing coronary artery bypass grafting (CABG) have changed. This study assessed the real-world impact of changing guidelines on the management of IMR during CABG over time. We hypothesized that the utilization of mitral valve repair for IMR would decrease over time, whereas mitral valve replacement for severe IMR would increase.MethodsPatients undergoing CABG in a statewide collaborative database (2011-2020) were stratified by severity of IMR. Trends in mitral valve repair or replacement were evaluated. To account for differences of the patients, propensity score–matched analyses were used to compare patients with and without mitral intervention.ResultsA total of 11,676 patients met inclusion criteria, including 1355 (11.6%) with moderate IMR and 390 (3.3%) with severe IMR. The proportion of patients undergoing mitral intervention for moderate IMR decreased over time (2011, 17.7%; 2020, 7.5%; Ptrend = .001), whereas mitral replacement for severe IMR remained stable (2011, 11.1%; 2020, 13.3%; Ptrend = .14). Major morbidity was higher for patients with moderate IMR who underwent mitral intervention (29.1% vs 19.9%; P = .005). In a propensity analysis of 249 well-matched pairs, there was no difference in major morbidity (29.3% with mitral intervention vs 23.7% without; P = .16) or operative mortality (1.2% vs 2.4%; P = .5).ConclusionsConsistent with recent guideline updates, patients with moderate IMR were less likely to undergo mitral repair. However, the rate of replacement for severe IMR did not change. Mitral intervention during CABG did not increase operative mortality or morbidity. 相似文献
10.
《Patient education and counseling》2022,105(7):2256-2263
ObjectiveTo examine the impact of an integrative medicine (IM) course on self-perceived IM-related communication and research skills.MethodsA 3-day mandatory "hybrid" (online and in-person) IM course was held within COVID-19 restrictions for 161 pre-clerkship medical students, with workshops facilitated by mentor healthcare professionals (IM and non-IM) and student-directed tasks. Self-perceived levels of 6 IM-related skills were scored (from 1 to 5) for history-taking; communicating with patients with "alternative" health-beliefs; referral to IM consultations; assessing risks/benefits; and working with non-medical IM practitioners.Results137 students (85.1%) completed pre-/post-course questionnaires, with overall scores improving from pre-course (1.98 ± 0.92) to post-course (3.31 ± 0.63; p < 0.0001), for the entire group and student subgroups (with vs. without prior IM experience). Multivariate analysis found no association between age, gender, primary language or prior experience with IM and improvement in skill scores.ConclusionsThe IM course increased self-perceived skill levels, reflecting the course curriculum and workshops. Further research needs to explore the application of these skills during clinical training.Practice implicationsTeaching medical students about IM in a course comprising communication and research skills was shown to be feasible and effective. The application of IM-related skills needs to be evaluated during the clinical clerkship. 相似文献