全文获取类型
收费全文 | 4940篇 |
免费 | 374篇 |
国内免费 | 82篇 |
专业分类
耳鼻咽喉 | 28篇 |
儿科学 | 227篇 |
妇产科学 | 67篇 |
基础医学 | 631篇 |
口腔科学 | 111篇 |
临床医学 | 479篇 |
内科学 | 1027篇 |
皮肤病学 | 516篇 |
神经病学 | 237篇 |
特种医学 | 480篇 |
外科学 | 491篇 |
综合类 | 65篇 |
预防医学 | 303篇 |
眼科学 | 29篇 |
药学 | 278篇 |
2篇 | |
中国医学 | 4篇 |
肿瘤学 | 421篇 |
出版年
2023年 | 26篇 |
2022年 | 33篇 |
2021年 | 73篇 |
2020年 | 52篇 |
2019年 | 86篇 |
2018年 | 104篇 |
2017年 | 86篇 |
2016年 | 94篇 |
2015年 | 115篇 |
2014年 | 148篇 |
2013年 | 189篇 |
2012年 | 218篇 |
2011年 | 237篇 |
2010年 | 189篇 |
2009年 | 176篇 |
2008年 | 187篇 |
2007年 | 209篇 |
2006年 | 184篇 |
2005年 | 170篇 |
2004年 | 132篇 |
2003年 | 128篇 |
2002年 | 105篇 |
2001年 | 109篇 |
2000年 | 103篇 |
1999年 | 122篇 |
1998年 | 168篇 |
1997年 | 180篇 |
1996年 | 153篇 |
1995年 | 124篇 |
1994年 | 133篇 |
1993年 | 114篇 |
1992年 | 72篇 |
1991年 | 85篇 |
1990年 | 88篇 |
1989年 | 118篇 |
1988年 | 99篇 |
1987年 | 85篇 |
1986年 | 81篇 |
1985年 | 80篇 |
1984年 | 59篇 |
1983年 | 45篇 |
1982年 | 44篇 |
1981年 | 43篇 |
1980年 | 39篇 |
1979年 | 27篇 |
1978年 | 30篇 |
1977年 | 32篇 |
1976年 | 37篇 |
1975年 | 34篇 |
1974年 | 26篇 |
排序方式: 共有5396条查询结果,搜索用时 15 毫秒
91.
Maria Wessman Inka Aho Kristina Thorsteinsson Merete Storgaard Isik S Johansen Suzanne Lunding Gitte Pedersen Anne‐Mette Lebech Pia Kivel Marie Helleberg Terese L Katzenstein Nina Weis 《Journal of the International AIDS Society》2015,18(1)
Introduction
As the human immunodeficiency virus (HIV)-positive population ages, issues concerning sexuality and fertility, among others, are becoming relevant. HIV is still surrounded by stigma and taboos, and there have been few studies conducted in industrialized settings concerning these questions. We therefore wanted to investigate the perception of sexuality and fertility in women living with HIV (WLWH) in an industrialized setting, using a questionnaire.Methods
WLWH were recruited at their regular outpatient clinic visits, at the major Departments of Infectious Diseases in Denmark and Finland, from January 2012 to October 2013. A questionnaire was developed, study participants were informed of the nature of study and, if they agreed to participate and signed a consent form, they filled in the questionnaire. Demographic information on the participants was obtained from patient files (in Finland) or from a national HIV cohort (in Denmark). Statistical analysis was performed using STATA®, version 11.Results
In total, 560 women were included in the study. The median age was 44 years. The majority were of white European origin, with fully suppressed HIV viral load, CD4 cell count >350 µL and mild or no symptoms of their HIV infection. A total of 62% were sexually active, stating condom use as their sole form of contraception. Of the sexually inactive women, one-third were in steady relationships. Eighty percent reported prior pregnancies, of which the majority had one or more children. Most children were born prior to the women''s HIV diagnosis and the mode of conception was predominantly natural. One-quarter of the participating women desired pregnancy, while more than half did not. The remaining quarter either stated that they already had the desired number of children or chose not to answer the question. Fourteen percent stated that their HIV diagnosis ended their wish for children; of these women, the median time of diagnosis was between 1995 and 1996. Pregnancy had been attempted unsuccessfully in one-quarter of study participants. The final question inquired what the risk of mother-to-child transmission was, with all precautions taken. Fifteen percent estimated the risk to be above two percent.Conclusions
In conclusion, the majority of WLWH in industrialized settings in Denmark and Finland have few HIV-related symptoms, are sexually active and have a strong desire for children. 相似文献92.
93.
Michael Moore Beth Stuart Samuel Coenen Chris C Butler Herman Goossens Theo JM Verheij Paul Little 《The British journal of general practice》2014,64(619):e75-e80
Background
Antibiotics are of limited overall clinical benefit for uncomplicated lower respiratory tract infection (LRTI) but there is uncertainty about their effectiveness for patients with features associated with higher levels of antibiotic prescribing.Aim
To estimate the benefits and harms of antibiotics for acute LRTI among those producing coloured sputum, smokers, those with fever or prior comorbidities, and longer duration of prior illness.Design and setting
Secondary analysis of a randomised controlled trial of antibiotic placebo for acute LRTI in primary care.Method
Two thousand and sixty-one adults with acute LRTI, where pneumonia was not suspected clinically, were given amoxicillin or matching placebo. The duration of symptoms, rated moderately bad or worse (primary outcome), symptom severity on days 2–4 (0–6 scale), and the development of new or worsening symptoms were analysed in pre-specified subgroups of interest. Evidence of differential treatment effectiveness was assessed in prespecified subgroups by interaction terms.Results
No subgroups were identified that were significantly more likely to benefit from antibiotics in terms of symptom duration or the development of new or worsening symptoms. Those with a history of significant comorbidities experienced a significantly greater reduction in symptom severity between days 2 and 4 (interaction term −0.28, P = 0.003; estimated effect of antibiotics among those with a past history −0.28 [95% confidence interval = −0.44 to −0.11], P = 0.001), equivalent to three people in 10 rating symptoms as a slight rather than a moderately bad problem. For subgroups not specified in advance antibiotics provided a modest reduction in symptom severity for non-smokers and for those with short prior illness duration (<7 days), and a modest reduction in symptom duration for those with short prior illness duration.Conclusion
There is no clear evidence of clinically meaningful benefit from antibiotics in the studied high-risk groups of patients presenting in general practice with uncomplicated LRTIs where prescribing is highest. Any possible benefit must be balanced against the side-effects and longer-term effects on antibiotic resistance. 相似文献94.
95.
96.
Lena Hanberger Niels Birkebaek Ragnar Bjarnason Ann Kristin Drivvoll Anders Johansen Torild Skrivarhaug Arni V. Thorsson Ulf Samuelsson 《Journal of diabetes science and technology》2014,8(4):738-744
Background:In 2008 a Nordic collaboration was established between the quality registries in Denmark, Iceland, Norway, and Sweden to improve quality of care for children with diabetes. This study aimed to describe those registries and confirm that the registry variables are comparable. Selected variables were used to demonstrate outcome measurements.Methods:The organization of the registries and methodology are described. Cross-sectional data for patients between birth and 14.9 years with type 1 diabetes mellitus in 2009 (n = 6523) from 89 centers were analyzed. Variables were age, gender, and diabetic ketoacidosis at onset, together with age, gender, HbA1c, insulin regimen, and severe hypoglycemia at follow-up in 2009.Results:All 4 registries use a standardized registration at the onset of diabetes and at follow-up, conducted at the local pediatric diabetes centers. Methods for measuring HbA1c varied as did methods of registration for factors such as hypoglycemia. No differences were found between the outcomes of the clinical variables at onset. Significant variations were found at follow-up for mean HbA1c, the proportion of children with HbA1c < 57 mmol/mol (NGSP/DCCT 7.4%), (range 15-31%), the proportion with insulin pumps (range 34-55%), and the numbers with severe hypoglycemia (range 5.6-8.3/100 patient years).Conclusions:In this large unselected population from 4 Nordic countries, a high proportion did not reach their treatment target, indicating a need to improve the quality of pediatric diabetes care. International collaboration is needed to develop and harmonize quality indicators and offers possibilities to study large geographic populations, identify problems, and share knowledge. 相似文献
97.
98.
99.
100.