全文获取类型
收费全文 | 1417篇 |
免费 | 81篇 |
国内免费 | 2篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 29篇 |
妇产科学 | 32篇 |
基础医学 | 149篇 |
口腔科学 | 14篇 |
临床医学 | 353篇 |
内科学 | 259篇 |
皮肤病学 | 26篇 |
神经病学 | 125篇 |
特种医学 | 9篇 |
外科学 | 113篇 |
综合类 | 17篇 |
一般理论 | 2篇 |
预防医学 | 174篇 |
眼科学 | 7篇 |
药学 | 115篇 |
中国医学 | 1篇 |
肿瘤学 | 71篇 |
出版年
2024年 | 2篇 |
2023年 | 15篇 |
2022年 | 16篇 |
2021年 | 63篇 |
2020年 | 38篇 |
2019年 | 35篇 |
2018年 | 34篇 |
2017年 | 22篇 |
2016年 | 34篇 |
2015年 | 33篇 |
2014年 | 45篇 |
2013年 | 69篇 |
2012年 | 78篇 |
2011年 | 83篇 |
2010年 | 50篇 |
2009年 | 38篇 |
2008年 | 67篇 |
2007年 | 103篇 |
2006年 | 84篇 |
2005年 | 80篇 |
2004年 | 90篇 |
2003年 | 93篇 |
2002年 | 69篇 |
2001年 | 51篇 |
2000年 | 53篇 |
1999年 | 39篇 |
1998年 | 11篇 |
1997年 | 11篇 |
1996年 | 7篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 8篇 |
1991年 | 8篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 11篇 |
1987年 | 8篇 |
1986年 | 7篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1981年 | 3篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有1500条查询结果,搜索用时 31 毫秒
1.
Sharisse M. Arnold Rehring Liza M. Reifler Jennifer H. Seidel Karen A. Glenn John F. Steiner 《Academic pediatrics》2019,19(5):572-580
ObjectiveClinical specialty societies recommend long-acting reversible contraceptives (LARCs) as first-line contraception for adolescent women. We evaluated whether a combined educational and process improvement intervention enhanced LARC placement in primary care within an integrated health care system.MethodsThe intervention included journal clubs, live continuing education, point-of-care guidelines, and new patient materials. We conducted a retrospective cohort study across 3 time periods: baseline (January 2013?September 2015), early implementation (October 2015–March 2016), and full implementation (April 2016–June 2017). The primary outcome was the proportion of LARCs placed by primary care clinicians among women aged 13 to 18 years compared with gynecology clinicians.ResultsKaiser Foundation Health Plan of Colorado cared for approximately 20,000 women aged 13 to 18 years in each calendar quarter between 2013 and 2017. Overall, LARC placement increased from 7.0 per 1000 members per quarter at baseline to 13.0 per 1000 during the full intervention. Primary care clinicians placed 6.2% of all LARCs in 2013, increasing to 32.1% by 2017 (P < .001), including 45.5% of contraceptive implants. Clinicians who attended educational sessions were more likely to adopt LARCs than those who did not (17.9% vs 6.4% respectively, P = .009). Neither overall LARC placement rates (relative risk, 1.9; 95% confidence interval, 0.7?5.6) nor contraceptive implant rates (relative risk, 3.0; 95% confidence interval, 0.9?9.8) increased significantly in clinicians who attended educational activities.ConclusionsThis multimodal intervention was associated with increased LARC placement for adolescent women in primary care. The combination of education and process improvement is a promising strategy to promote clinician behavior change. 相似文献
2.
3.
The incidence of neural tube defects in a rural area of the west of Ireland from 1974 to 1985 was 2.96 per 1000. The prevalence was unchanged during the 11 years. When compared with a control group there was no increased incidence of anaemia in mothers of affected infants. 相似文献
4.
Abnormal biochemical and cellular parameters in the blood of patients with Raynauds phenomenon 总被引:2,自引:0,他引:2
J J Belch J Drury K McLaughlin A O'Dowd J Anderson R D Sturrock C D Forbes 《Scottish medical journal》1987,32(1):12-14
Finger blood flow is decreased in Raynauds Phenomenon (RP). This may be due not only to vasospasm, but also to blood abnormalities. 40 patients with Raynauds Disease (RD), 28 with suspected RP (SS) and 42 with secondary Raynauds syndrome (RS) were enrolled and compared to 50 controls. Results from base-line samples show that those with RP have abnormal haemostasis and rheology whereas those with mild Raynauds, RD do not. Blood sampled after cold challenge in 15 RS patients and 15 controls show that both groups exhibit platelet activation after emersion. The degree of activation however was much more marked in the RS patients. We have shown that abnormalities of haemostasis and rheology are found in patients likely to have endothelial damage (RS). These changes are probably a consequence rather than a cause of the disease. After cold challenge the results become more abnormal and correlate with severity of disease. 相似文献
5.
Steven JY Wang Claire Cornick Jacqueline O'Dowd Michael A Cawthorne Jonathan R S Arch 《Lipids in health and disease》2007,6(1):2
Background
Mice that lack acyl CoA:diacylglycerol acyltransferase (Dgat1 -/- mice) are reported to have a reduced body fat content and improved glucose tolerance and insulin sensitivity. Studies so far have focussed on male null mice fed a high fat diet and there are few data on heterozygotes. We compared male and female Dgat1 -/-, Dgat1 +/- and Dgat1 +/+ C57Bl/6 mice fed on either standard chow or a high fat diet. 相似文献6.
7.
BACKGROUND: Urinary incontinence is a common problem for adult women. It results in a large financial and psychosocial cost. Much urinary incontinence goes unreported. Women with urinary incontinence can be successfully assessed and treated in general practice but studies have shown that many GPs manage the condition inadequately. AIM: This study aims to examine GPs' awareness of urinary incontinence in women and their management of, and attitudes to, female urinary incontinence. METHOD: A qualitative study was conducted with 21 GPs responding to semi-structured interviews. Thematic analysis was carried out on these interviews, with recurrent views and experiences being identified and grouped. RESULTS: The interviews of 11 male and nine female GPs were suitable for analysis. GPs were aware of the prevalence and under-reporting of urinary incontinence in women. Many were unhappy with their own management of the condition and with the management options available to them. Male GPs in particular were reluctant to carry out gynaecological examinations, and few GPs expressed enthusiasm for teaching pelvic floor exercises or bladder drills. Medications were frequently used but generally considered ineffective or intolerable. The services of both public health nurses and practice nurses were under-used, largely because of lack of training in this area. Although incontinence nurses were employed in the area, many GPs did not know of their availability and, of those who did, few referred to them more than infrequently. CONCLUSION: This study demonstrates that many GPs avoid dealing with the problem of urinary incontinence in women and that they find it to be a difficult, chronic problem to treat. Specialist options seem not to be useful in general practice. The findings need to be explored in other GP settings. 相似文献
8.
Weight change adjusted equations for assessing resting metabolic rate in overweight and obese adults
Moran Nachmani Yair Lahav Aviva Zeev Liza Grosman-Rimon Sigal Eilat-Adar 《Obesity research & clinical practice》2021,15(3):221-226
BackgroundAlthough over one hundred equations have been developed to predict the energy expenditure of individuals, none are sensitive to weight change in assessment of resting metabolic rate (RMR) before and after weight loss.ObjectiveTo formulate adjusted equations for overweight and obese individuals and to compare their accuracy with existing prediction RMR equations before and after weight loss.Subjects/materialsThis is historical prospective study. Participants included 39 overweight and obese men and women before and after losing 10–20% from baseline weight on a diet and physical activity regimen for at least three months. Pre and post weight loss measured RMR results were compared to estimated RMR using several existing prediction equations: Harris and Benedict, Ravussin and Bogardus, and Mifflin et al. To improve the accuracy of these prediction equations, we suggest new equations adjusted for weight loss, based on measured RMR and evaluated their accuracy.ResultsPre and post weight loss data indicated: significant fat reduction in both genders; reduction in free-fat mass only in men, and a significant decrease in measured RMR only in women. Our suggested equations were the most accurate and closest to measured RMR in both genders, in comparison to the Harris and Benedict, Ravussin and Bogardus, and Mifflin et al equation results. Estimated RMR using the latter equations was significantly lower than measured RMR in both genders at pre and post weight loss (P < 0.01).ConclusionsThis study highlights the need for adjusting RMR equations before and after weight loss in overweight and obese individuals. Further research is needed to validate our suggested equations. 相似文献
9.
Gareth Crouch Nitesh D Dhanekula Karen Byth Emma Burn Sue Lynn Lau Lillias Nairn Liza Nery Jean Doyle Edward Graham Andrew Ellis Roderick J Clifton-Bligh Christian M Girgis 《Journal of bone and mineral research》2021,36(5):910-920
Atypical femur fractures (AFF) are a rare but serious complication of long-term bisphosphonate use. Although clearly defined by ASBMR criteria, a proportion of patients with AFFs may go unrecognized and the use of qualitative fracture criteria may lead to uncertainty in AFF diagnosis, with significant therapeutic implications. A score that rapidly and accurately identifies AFFs among subtrochanteric femur fractures using quantitative, measurable parameters is needed. In a retrospective cohort of 110 female patients presenting with AFFs or typical femur fractures (TFFs), multiple logistic regression and decision tree analysis were used to develop the Sydney AFF score. This score, based on demographic and femoral geometry variables, uses three dichotomized independent predictors and adds one point for each: (age ≤80 years) + (femoral neck width <37 mm) + (lateral cortical width at lesser trochanter ≥5 mm), (score, 0 to 3). In an independent validation set of 53 female patients at a different centre in Sydney, a score ≥2 demonstrated 73.3% sensitivity and 69.6% specificity for AFF (area under the receiver-operating characteristic curve [AUC] 0.775, SE 0.063) and remained independently associated with AFF after adjustment for bisphosphonate use. The Sydney AFF score provides a quantitative means of flagging female patients with atraumatic femur fractures who have sustained an AFF as opposed to a TFF. This distinction has clear management implications and may augment current ASBMR diagnostic criteria. © 2021 American Society for Bone and Mineral Research (ASBMR). 相似文献
10.
Liza Johannesson Anji Wall Andreas Tzakis Cristiano Quintini Elliott G. Richards Kathleen O’Neill Paige M. Porrett Giuliano Testa 《American journal of transplantation》2021,21(5):1699-1704
The parallel emergence of uterus transplantation (UTx) and other transplantation innovations including face and hand transplantation led to the categorization of the uterus as a vascular composite allograft (VCA). With >60 transplants and >20 births worldwide, UTx is transitioning rapidly from a research endeavor to an effective treatment option for women with uterine factor infertility. While it originally made sense to group the innovations under one umbrella, it is time to revisit the designation of UTx as a VCA. We describe how UTx needs unique policy, procedural codes, insurance contracts, and educational initiatives. We contend that separating UTx from VCAs may become necessary in the future to avoid hindering the growth and regulation of this field. 相似文献