全文获取类型
收费全文 | 6303篇 |
免费 | 487篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 29篇 |
儿科学 | 261篇 |
妇产科学 | 170篇 |
基础医学 | 888篇 |
口腔科学 | 146篇 |
临床医学 | 677篇 |
内科学 | 1310篇 |
皮肤病学 | 91篇 |
神经病学 | 636篇 |
特种医学 | 113篇 |
外科学 | 644篇 |
综合类 | 42篇 |
一般理论 | 2篇 |
预防医学 | 734篇 |
眼科学 | 99篇 |
药学 | 411篇 |
中国医学 | 5篇 |
肿瘤学 | 546篇 |
出版年
2023年 | 75篇 |
2022年 | 60篇 |
2021年 | 221篇 |
2020年 | 172篇 |
2019年 | 198篇 |
2018年 | 200篇 |
2017年 | 187篇 |
2016年 | 178篇 |
2015年 | 208篇 |
2014年 | 254篇 |
2013年 | 386篇 |
2012年 | 474篇 |
2011年 | 532篇 |
2010年 | 259篇 |
2009年 | 239篇 |
2008年 | 420篇 |
2007年 | 431篇 |
2006年 | 387篇 |
2005年 | 381篇 |
2004年 | 317篇 |
2003年 | 274篇 |
2002年 | 287篇 |
2001年 | 50篇 |
2000年 | 48篇 |
1999年 | 48篇 |
1998年 | 50篇 |
1997年 | 38篇 |
1996年 | 33篇 |
1995年 | 23篇 |
1994年 | 24篇 |
1993年 | 13篇 |
1992年 | 24篇 |
1991年 | 18篇 |
1990年 | 21篇 |
1989年 | 12篇 |
1988年 | 21篇 |
1987年 | 26篇 |
1986年 | 14篇 |
1985年 | 24篇 |
1984年 | 17篇 |
1983年 | 13篇 |
1982年 | 11篇 |
1979年 | 9篇 |
1978年 | 8篇 |
1977年 | 9篇 |
1975年 | 10篇 |
1974年 | 10篇 |
1973年 | 8篇 |
1970年 | 13篇 |
1968年 | 9篇 |
排序方式: 共有6804条查询结果,搜索用时 203 毫秒
991.
992.
993.
994.
Kirsten M.J. Thompson MPH Diana Greene Foster PhD Cynthia C. Harper PhDAuthor vitae 《Women's health issues》2011,21(6):425
Background
Modern intrauterine contraception (IUC) is safe and highly effective, but is used by fewer than 4% of women in the United States. Once recommended only for women with at least one child, it is now recommended for most women regardless of parity or age.Methods
This study used data representative of California women from 10 years of the California Women’s Health Survey (1997–2007) to describe how IUC users differ from women using other contraceptives, and assess changes in IUC users’ characteristics over time.Findings
Overall 4.9% of women in California used IUC. Multivariable logistic regression modeling showed IUC users were more likely to be born outside the United States (odds ratio [OR], 1.7), have a college degree (OR, 1.5) or postgraduate degree (OR, 2.2), and be married (OR, 2.6) or in an unmarried partnership (OR, 2.4). IUC users were 71% less likely to be nulliparous (OR, 0.29). Use of IUC almost doubled over the study period from 4.0% to 7.2%, and this growth was accompanied by significant changes in user characteristics: Young women, women born in the United States, women without a college degree, and Asian women experienced the greatest increases. IUC use among nulliparous women did not increase.Conclusion
IUC use in California is higher than the national average and growing. We found higher IUC use among ever-married women and foreign-born women, and disproportionately low use among nulliparous women. Efforts to inform women of IUC’s high effectiveness and safety, as well as efforts to ensure that health care providers have the necessary clinical skills, are timely and important. 相似文献995.
The purpose of this grounded theory study was to investigate how Danish HIV-positive persons live with their disease, focusing on HIV-related stressors. Using the Glaserian method, we analyzed textual data from in-depth interviews with 16 HIV-positive persons. Decisions about disclosure appeared to be a major concern and a determining factor for HIV-related stress. Consequently, we developed a substantive theory about disclosure decisions in which three different strategies could be identified: (a) disclosing to everyone (being open); (b) restricting disclosure (being partly open); and (c) disclosing to no one (being closed). Disclosure was a continuum; none of the three strategies automatically relieved HIV-related stress. The theory describes the main determinants and consequences of each strategy. Our study demonstrates the importance of recurrent individual considerations about disclosure choices and plans, and offers a theoretical basis for interventions designed to assist persons living with HIV to make the best possible individual decisions regarding disclosure, and thereby reduce HIV-related stress. 相似文献
996.
997.
Palacios G Lowenstine LJ Cranfield MR Gilardi KV Spelman L Lukasik-Braum M Kinani JF Mudakikwa A Nyirakaragire E Bussetti AV Savji N Hutchison S Egholm M Lipkin WI 《Emerging infectious diseases》2011,17(4):711-713
The genetic relatedness of mountain gorillas and humans has led to concerns about interspecies transmission of infectious agents. Human-to-gorilla transmission may explain human metapneumovirus in 2 wild mountain gorillas that died during a respiratory disease outbreak in Rwanda in 2009. Surveillance is needed to ensure survival of these critically endangered animals. 相似文献
998.
999.
SCAI/CCAS/SPA expert consensus statement for anesthesia and sedation practice: Recommendations for patients undergoing diagnostic and therapeutic procedures in the pediatric and congenital cardiac catheterization laboratory 下载免费PDF全文
Kirsten C. Odegard MD Robert Vincent MD FSCAI FACC Rahul Baijal MD SuAnne Daves MD Robert Gray MD Alex Javois MD Barry Love MD Phil Moore MD FSCAI David Nykanen MD FSCAI Lori Riegger MD Scott G. Walker MD Elizabeth C. Wilson MD 《Catheterization and cardiovascular interventions》2016,88(6):912-922
Current practice of sedation and anesthesia for patients undergoing pediatric congenital cardiac catheterization laboratory (PCCCL) procedures is known to vary among institutions, a multi‐society expert panel with representatives from the Congenital Heart Disease Council of the Society for Cardiovascular Angiography and Interventions (SCAI), the Society for Pediatric Anesthesia (SPA) and the Congenital Cardiac Anesthesia Society (CCAS) was convened to evaluate the types of sedation and personnel necessary for procedures performed in the PCCCL. The goal of this panel was to provide practitioners and institutions performing these procedures with guidance consistent with national standards and to provide clinicians and institutions with consensus‐based recommendations and the supporting references to encourage their application in quality improvement programs. Recommendations can neither encompass all clinical circumstances nor replace the judgment of individual clinicians in the management of each patient. The science of medicine is rooted in evidence, and the art of medicine is based on the application of this evidence to the individual patient. This expert consensus statement has adhered to these principles for optimal management of patients requiring sedation and anesthesia. What follows are recommendations for patient monitoring in the PCCCL regardless of whether minimal or no sedation is being used or general anesthesia is being provided by an anesthesiologist. © 2016 Wiley Periodicals Inc. 相似文献
1000.