全文获取类型
收费全文 | 2562篇 |
免费 | 200篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 182篇 |
妇产科学 | 35篇 |
基础医学 | 336篇 |
口腔科学 | 53篇 |
临床医学 | 283篇 |
内科学 | 575篇 |
皮肤病学 | 34篇 |
神经病学 | 77篇 |
特种医学 | 498篇 |
外科学 | 245篇 |
综合类 | 48篇 |
一般理论 | 1篇 |
预防医学 | 169篇 |
眼科学 | 18篇 |
药学 | 107篇 |
中国医学 | 3篇 |
肿瘤学 | 118篇 |
出版年
2022年 | 14篇 |
2021年 | 17篇 |
2020年 | 18篇 |
2019年 | 14篇 |
2018年 | 35篇 |
2017年 | 20篇 |
2016年 | 37篇 |
2015年 | 45篇 |
2014年 | 50篇 |
2013年 | 83篇 |
2012年 | 57篇 |
2011年 | 76篇 |
2010年 | 90篇 |
2009年 | 80篇 |
2008年 | 70篇 |
2007年 | 52篇 |
2006年 | 81篇 |
2005年 | 42篇 |
2004年 | 34篇 |
2003年 | 42篇 |
2002年 | 51篇 |
2001年 | 38篇 |
2000年 | 52篇 |
1999年 | 56篇 |
1998年 | 149篇 |
1997年 | 125篇 |
1996年 | 138篇 |
1995年 | 102篇 |
1994年 | 94篇 |
1993年 | 100篇 |
1992年 | 54篇 |
1991年 | 39篇 |
1990年 | 38篇 |
1989年 | 89篇 |
1988年 | 63篇 |
1987年 | 61篇 |
1986年 | 68篇 |
1985年 | 74篇 |
1984年 | 39篇 |
1983年 | 50篇 |
1982年 | 49篇 |
1981年 | 31篇 |
1980年 | 47篇 |
1979年 | 30篇 |
1978年 | 27篇 |
1977年 | 30篇 |
1976年 | 29篇 |
1975年 | 34篇 |
1974年 | 10篇 |
1971年 | 17篇 |
排序方式: 共有2785条查询结果,搜索用时 31 毫秒
1.
Raymond J. Chan RN PhD Vivienne E. Milch MBBS MHPol Fiona Crawford-Williams PhD Oluwaseyifunmi Andi Agbejule BRadTherapy Ria Joseph MNutrDiet Jolyn Johal BND Narayanee Dick BSc Matthew P. Wallen PhD Julie Ratcliffe PhD Anupriya Agarwal MBBS Larissa Nekhlyudov MD Matthew Tieu PhD Manaf Al-Momani BPharm Scott Turnbull PhD Rahul Sathiaraj MPH Dorothy Keefe MBBS MD Nicolas H. Hart PhD 《CA: a cancer journal for clinicians》2023,73(6):565-589
Patient navigation is a strategy for overcoming barriers to reduce disparities and to improve access and outcomes. The aim of this umbrella review was to identify, critically appraise, synthesize, and present the best available evidence to inform policy and planning regarding patient navigation across the cancer continuum. Systematic reviews examining navigation in cancer care were identified in the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Embase, Cumulative Index of Nursing and Allied Health (CINAHL), Epistemonikos, and Prospective Register of Systematic Reviews (PROSPERO) databases and in the gray literature from January 1, 2012, to April 19, 2022. Data were screened, extracted, and appraised independently by two authors. The JBI Critical Appraisal Checklist for Systematic Review and Research Syntheses was used for quality appraisal. Emerging literature up to May 25, 2022, was also explored to capture primary research published beyond the coverage of included systematic reviews. Of the 2062 unique records identified, 61 systematic reviews were included. Fifty-four reviews were quantitative or mixed-methods reviews, reporting on the effectiveness of cancer patient navigation, including 12 reviews reporting costs or cost-effectiveness outcomes. Seven qualitative reviews explored navigation needs, barriers, and experiences. In addition, 53 primary studies published since 2021 were included. Patient navigation is effective in improving participation in cancer screening and reducing the time from screening to diagnosis and from diagnosis to treatment initiation. Emerging evidence suggests that patient navigation improves quality of life and patient satisfaction with care in the survivorship phase and reduces hospital readmission in the active treatment and survivorship care phases. Palliative care data were extremely limited. Economic evaluations from the United States suggest the potential cost-effectiveness of navigation in screening programs. 相似文献
2.
Letter: faecal volatile organic metabolites,promising biomarkers in inflammatory bowel disease and Letter: faecal volatile organic metabolites as novel diagnostic biomarkers in inflammatory bowel disease. Authors’ reply 下载免费PDF全文
I. Ahmed R. Greenwood B. Costello N. Ratcliffe C. Probert 《Alimentary pharmacology & therapeutics》2016,43(11):1241-1242
3.
JA HYEON KU CHEOL KWAK SEUNG-JUNE OH EUNSIK LEE SANG EUN LEE JAE-SEUNG PAICK 《International journal of urology》2004,11(7):489-493
BACKGROUND: Our aims in the present study were to estimate the influences of pain and urinary symptoms on quality of life, and to determine which of these two variables has the most predictive power with respect to quality of life in young men with chronic prostatitis-like symptoms. METHODS: Chronic prostatitis-like symptoms were measured by the National Institutes of Health-Chronic Prostatitis Symptom Index. Of the 28,841 men aged 20 years who lived in the study community, 18,495 men (a response rate 64.1%) agreed to participate in the study. A total of 1057 men who complained of symptoms indicative of chronic prostatitis were included in the study. The influences of pain and urinary symptoms on quality of life were determined using logistic regression analysis. The receiver operating characteristic (ROC) curve was used to estimate the predictive ability of each of these variables with respect to quality of life. RESULTS: Results from multivariate analysis showed that both pain and urinary symptoms were associated with an increased likelihood of impaired quality of life, although pain contributed more to a reduced quality of life than urinary symptoms. Relative to men who experienced mild pain, men who experienced moderate pain had a 3.9-fold risk of poor quality of life (odds ratio [OR], 3.87; 95% confidence interval [CI], 2.86-5.23; P < 0.001) and those who experienced severe pain had a 15.7-fold risk of reduced quality of life (OR, 15.68; 95% CI, 6.59-37.35; P < 0.001). Moderate urinary symptoms were associated with a 1.4-fold risk of bother (OR, 1.41; 95% CI, 1.01-1.99; P < 0.001) and severe urinary symptoms were associated with 2.4-fold risk (OR, 2.39; 95% CI, 1.37-4.12; P < 0.001), relative to mild urinary symptoms. Comparison of the effects of pain and urinary symptoms showed that pain severity had the most predictive power for bother, quality of life, and quality-of-life impact. The areas under the ROC curves for bother, quality of life, and quality-of-life impact were 71.3%, 69.3% and 72.5%, respectively. CONCLUSION: Urinary symptoms and pain might be associated with an increased likelihood of impaired quality of life in young men with chronic prostatitis-like symptoms. In addition, our findings suggest that pain severity is the most influential variable for determining quality of life in this population. 相似文献
4.
5.
6.
Oxygen-regulated control elements in the phosphoglycerate kinase 1 and lactate dehydrogenase A genes: similarities with the erythropoietin 3'' enhancer. 总被引:18,自引:5,他引:13 下载免费PDF全文
7.
8.
9.
10.
M J Seibel F Gartenberg S J Silverberg A Ratcliffe S P Robins J P Bilezikian 《The Journal of clinical endocrinology and metabolism》1992,74(3):481-486
Urinary concentrations of the collagen cross-links, pyridinoline (PYD) and deoxypyridinoline (DPD), were determined in 87 patients with untreated or surgically treated primary hyperparathyroidism (PHPT). Eighty-four healthy individuals, matched for age and sex, constituted the control group for the excretion of pyridinium cross-links. In addition, a subgroup of 25 patients with PHPT was followed longitudinally for up to 2 yr after successful parathyroidectomy. Mean urinary excretion of PYD (46.8 +/- 2.7 nmol/mmol creatinine) and DPD (17.6 +/- 1.3 nmol/mmol creatinine) was significantly higher in patients with untreated PHPT than in normal subjects (P less than 0.001). In the group undergoing successful parathyroidectomy, mean urinary concentrations of PYD (34 +/- 2.5) and DPD (9.4 +/- 0.8) were similar to those in normal controls and significantly lower than those in the untreated patient population (P less than 0.001). The urinary concentration of both cross-links was significantly correlated with serum levels of both alkaline phosphatase and PTH. Mean urinary concentrations of both cross-link compounds decreased significantly within 6 months in patients followed longitudinally and as early as 2 weeks after surgery in individual patients compared to presurgical baseline values. These changes preceded the reduction in serum alkaline phosphatase and hydroxyproline by approximately 6 months. The results demonstrate that urinary hydroxypyridinium cross-links of collagen are useful indices in the clinical assessment of bone involvement in PHPT. 相似文献