首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5043篇
  免费   470篇
  国内免费   35篇
耳鼻咽喉   51篇
儿科学   260篇
妇产科学   78篇
基础医学   763篇
口腔科学   131篇
临床医学   594篇
内科学   948篇
皮肤病学   115篇
神经病学   337篇
特种医学   246篇
外科学   706篇
综合类   64篇
一般理论   2篇
预防医学   530篇
眼科学   143篇
药学   261篇
中国医学   9篇
肿瘤学   310篇
  2023年   57篇
  2022年   73篇
  2021年   166篇
  2020年   114篇
  2019年   156篇
  2018年   190篇
  2017年   153篇
  2016年   143篇
  2015年   175篇
  2014年   253篇
  2013年   326篇
  2012年   364篇
  2011年   329篇
  2010年   225篇
  2009年   207篇
  2008年   207篇
  2007年   240篇
  2006年   211篇
  2005年   164篇
  2004年   156篇
  2003年   127篇
  2002年   133篇
  2001年   65篇
  2000年   73篇
  1999年   60篇
  1998年   129篇
  1997年   108篇
  1996年   112篇
  1995年   80篇
  1994年   86篇
  1993年   49篇
  1992年   46篇
  1991年   37篇
  1990年   24篇
  1989年   52篇
  1988年   55篇
  1987年   46篇
  1986年   40篇
  1985年   50篇
  1984年   25篇
  1983年   23篇
  1982年   30篇
  1981年   25篇
  1980年   18篇
  1979年   20篇
  1978年   11篇
  1977年   15篇
  1976年   21篇
  1975年   14篇
  1974年   11篇
排序方式: 共有5548条查询结果,搜索用时 15 毫秒
81.
82.
Journal of Thrombosis and Thrombolysis - Although certain risk factors have been associated with morbidity and mortality, validated emergency department (ED) derived risk prediction models specific...  相似文献   
83.
84.
Interprofessional collaboration is fundamental to providing optimal patient care. The readiness of the team entering a framework of interprofessional collaborative practice is critical to its success. In this study, we conducted an interprofessional education (IPE) activity for medical and nursing students in an acute care setting. Over nine occasions, 21 student pairs (one nursing and one medical student per pair) jointly assessed a patient and created a list of problems and interventions to achieve the patient’s goals. Immediately after the activity, students were debriefed to gain insight into their experiences. Debriefing sessions were audiotaped and analysed using a phenomenological approach and four major themes were identified. Overall, students felt responsible for representing their profession and were initially apprehensive about the interprofessional task. Nevertheless, they identified their own shortcomings and recognized the value in their partner’s approach. These realizations promoted convergence on a shared vision to provide optimal care for patients as a team. Acknowledging and understanding these perceptions may help design better ways to improve patient care. This educational model may be utilized by others who are seeking IPE activities in acute care.  相似文献   
85.
ObjectiveTo assess the association between the employment status of human immunodeficiency virus (HIV)-infected individuals and adherence to antiretroviral therapy (ART).MethodsWe searched the Medline, Embase and Cochrane Central Register of Controlled Trials databases for studies reporting ART adherence and employment status published between January 1980 and September 2014. Information from a wide range of other sources, including the grey literature, was also analysed. Two independent reviewers extracted data on treatment adherence and study characteristics. Study data on the association between being employed and adhering to ART were pooled using a random-effects model. Between-study heterogeneity and sources of bias were evaluated.FindingsThe meta-analysis included 28 studies published between 1996 and 2014 that together involved 8743 HIV-infected individuals from 14 countries. The overall pooled odds ratio (OR) for the association between being employed and adhering to ART was 1.27 (95% confidence interval, CI: 1.04–1.55). The association was significant for studies from low-income countries (OR: 1.85, 95% CI: 1.58–2.18) and high-income countries (OR: 1.33, 95% CI: 1.02–1.74) but not middle-income countries (OR: 0.94, 95% CI: 0.62–1.42). In addition, studies published after 2011 and larger studies showed less association between employment and adherence than earlier and small studies, respectively.ConclusionEmployed HIV-infected individuals, particularly those in low- and high-income countries, were more likely to adhere to ART than unemployed individuals. Further research is needed on the mechanisms by which employment and ART adherence affect each other and on whether employment-creation interventions can positively influence ART adherence, HIV disease progression and quality of life.  相似文献   
86.
Objectives. We assessed whether living in counties with Title X clinics and increased use of long-acting reversible contraception (LARC) in Colorado are associated with decreased risk of adverse birth outcomes.Methods. We linked Title X clinic counties to the Colorado birth data set by using the mother’s county of residence. We compared low birth weight (LBW) and preterm birth (PTB) in 2008 and 2012, in counties with and without Title X clinics. We compared the relationship between LARC use and the incidence of LBW or PTB in 2012 for women living in counties with Title X clinics.Results. For women living in counties with Title X clinics, the odds of PTB were significantly lower in 2012 compared with 2008 (odds ratio = 0.85; 95% confidence interval = 0.81, 0.89; interaction P = .02). For women living in Title X clinic counties in 2012, a higher proportion of LARC use (> 12.4%) was significantly associated with decreased risk of PTB (P = .02) compared with a low proportion of LARC use (≤ 4.96%).Conclusions. Improved access to family planning services and increased use of LARC are associated with lower risk of PTB.Unintended pregnancy is a significant public health issue in the United States. According to the most recent published estimates, 51% of pregnancies in the United States were unintended, and 60% of unintended pregnancies resulted in a live birth.1 Unintended pregnancies are associated with increased risk of adverse pregnancy outcomes, such as preterm birth (PTB) and delivery of low–birth weight (LBW) infants.2–8 In a large systematic review, Shah et al. reported increased odds of PTB (odds ratio [OR] = 1.31; 95% confidence interval [CI] = 1.09, 1.58) and LBW (OR = 1.36; 95% CI = 1.25, 1.48) among unintended pregnancies ending in live birth compared with intended pregnancies.2 The link between unintended pregnancy and poor birth outcomes is likely multifaceted, and may be associated with maternal socioeconomic risk factors, inadequate prenatal care, and preconceptual and prenatal maternal behavioral risk factors such as smoking and alcohol use.9–11 As part of the national effort to improve overall public health, increasing the proportion of pregnancies that are intended and decreasing the rates of PTB and LBW deliveries are all objectives of the Healthy People 2020 initiative.12In 2008, 37% of live births in Colorado resulted from unintended pregnancies according to the Pregnancy Risk Assessment Monitoring System.13 To address this issue, the Colorado Initiative to Reduce Unintended Pregnancy (Colorado Initiative) was developed and enacted in 2009 with the generous support of an anonymous donor.14 As part of the effort, the Colorado Family Planning Initiative was implemented through the Colorado Department of Public Health and Environment. Two of the primary goals of the initiative were (1) increasing the number of women accessing family planning services and (2) increasing the adoption of long-acting reversible contraceptive (LARC) methods such as intrauterine devices and contraceptive implants.14 Long-acting reversible contraceptive methods are safe and highly effective forms of contraception that have been shown to reduce rates of unintended pregnancy.15–18To help achieve these objectives, the Colorado Initiative provided funding to 28 Title X–funded agencies across the state of Colorado from 2009 to 2013, serving 37 of 64 Colorado counties. Those 37 counties were home to 95% of the state’s low-income population (defined as individuals with incomes at or below 150% of the federal poverty level).14 The locations of Colorado Title X clinics are shown in Figure 1. This distribution of resources in Colorado is important, in light of the known disparities of unintended pregnancy rates for women on the basis of socioeconomic status, age, race/ethnicity, and level of education.1Open in a separate windowFIGURE 1—Counties and locations of Title X clinics: Colorado, 2008 and 2012.The funding for the Colorado Initiative specifically supported the provision of intrauterine devices and contraceptive implants to women seeking care at Title X clinics, training for providers and staff on the counseling and provision of LARC methods, and technical assistance to Title X agencies related to increasing the use of these methods.14 Many of the Title X clinics across the state successfully executed the primary objectives of the Colorado Initiative, resulting in a rise in the total number of clients accessing family planning services per year from 46 201 to 64 148 and the proportion of women choosing LARC methods out of all women using contraception at Title X clinics from 0.8% to 8.6% from 2008 to 2012 (G. Klinger, Colorado Department of Public Health and Environment, e-mail communication, April 1, 2014).Although LARC use is on the rise in the United States, there is little in the published literature demonstrating an association between the use of LARC methods and rates of adverse birth outcomes.19 Given the scale of the Colorado Initiative, there is a unique opportunity to evaluate this possible association. As a result of improved use of family planning services in general and LARC use in particular, we hypothesized the following: (1) there will be a significant decrease in LBW and PTB in Colorado from 2008 to 2012; (2) for women living in Colorado counties in 2012 compared with 2008, LBW and PTB will differ by whether there is a Title X clinic in that woman’s county of residence; and (3) for women living in Colorado counties with Title X clinics in 2012, there will be a significant inverse association between LARC use at Title X clinics and LBW and PTB.  相似文献   
87.

Objective

To evaluate the impact of opioid controlled substance agreements (CSAs) enrollment on health care utilization.

Patients and Methods

We retrospectively evaluated health care utilization changes among 772 patients receiving long-term opioid therapy for chronic noncancer pain enrolled in a CSA between July 1, 2015, and December 31, 2015. We ascertained patient characteristics and utilization 12 months before and after CSA enrollment. Decreased utilization was defined as a decrease of 1 or more hospitalizations or emergency department visits and 3 or more outpatient primary and specialty care visits. Multivariate modeling assessed demographic characteristics associated with utilization changes.

Results

The 772 patients enrolled in an opioid CSA during the study period had a mean ± SD age of 63.5±14.9 years and were predominantly female, white, and married. The CSA enrollment was associated with decreased outpatient primary care visits (odds ratio [OR], 0.16; 95% CI, 0.14-0.19) and increased diagnostic radiology services (OR, 1.22; 95% CI, 1.02-1.47). After CSA enrollment, patients with greater comorbidity (Charlson Comorbidity Index score >3) were more likely to have reduced hospitalizations (adjusted OR, 2.8; 95% CI, 1.3-6.0; P=.008), reduced outpatient primary care visits (adjusted OR, 2.0; 95% CI, 1.2-3.2; P=.005), and reduced specialty care visits (adjusted OR, 2.0; 95% CI, 1.2-3.3; P=.006).

Conclusion

For patients receiving long-term opioid therapy for chronic noncancer pain, CSA enrollment is associated with reductions in primary care visits and increased radiologic service utilization. Patients with greater comorbidity were more likely to have reductions in hospitalizations, outpatient primary care visits, and outpatient specialty clinic visits after CSA enrollment. The observational nature of the study does not allow the conclusion that CSA implementation is the primary reason for these observed changes.  相似文献   
88.
89.
90.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号