全文获取类型
收费全文 | 1992篇 |
免费 | 165篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 146篇 |
妇产科学 | 29篇 |
基础医学 | 246篇 |
口腔科学 | 42篇 |
临床医学 | 296篇 |
内科学 | 451篇 |
皮肤病学 | 26篇 |
神经病学 | 63篇 |
特种医学 | 242篇 |
外科学 | 212篇 |
综合类 | 55篇 |
一般理论 | 1篇 |
预防医学 | 168篇 |
眼科学 | 12篇 |
药学 | 86篇 |
1篇 | |
肿瘤学 | 90篇 |
出版年
2022年 | 10篇 |
2021年 | 13篇 |
2020年 | 16篇 |
2019年 | 14篇 |
2018年 | 30篇 |
2017年 | 21篇 |
2016年 | 23篇 |
2015年 | 38篇 |
2014年 | 43篇 |
2013年 | 45篇 |
2012年 | 53篇 |
2011年 | 72篇 |
2010年 | 56篇 |
2009年 | 69篇 |
2008年 | 63篇 |
2007年 | 38篇 |
2006年 | 67篇 |
2005年 | 39篇 |
2004年 | 33篇 |
2003年 | 42篇 |
2002年 | 51篇 |
2001年 | 38篇 |
2000年 | 41篇 |
1999年 | 50篇 |
1998年 | 98篇 |
1997年 | 91篇 |
1996年 | 104篇 |
1995年 | 69篇 |
1994年 | 71篇 |
1993年 | 63篇 |
1992年 | 52篇 |
1991年 | 39篇 |
1990年 | 34篇 |
1989年 | 66篇 |
1988年 | 49篇 |
1987年 | 49篇 |
1986年 | 41篇 |
1985年 | 57篇 |
1984年 | 36篇 |
1983年 | 38篇 |
1982年 | 31篇 |
1981年 | 28篇 |
1980年 | 20篇 |
1979年 | 20篇 |
1978年 | 18篇 |
1977年 | 21篇 |
1976年 | 15篇 |
1975年 | 18篇 |
1974年 | 10篇 |
1971年 | 17篇 |
排序方式: 共有2169条查询结果,搜索用时 15 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.
PJ Commerford 《Cardiovascular journal of Africa》2015,26(4):151-Aug;26(4):151
3.
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
4.
Hans Bosma Martin PJ van Boxtel Gertrudis IJM Kempen Jacques ThM van Eijk Jelle Jolles 《BMC public health》2007,7(1):179
Background
The aims of this study were to examine the extent to which higher intellectual abilities protect higher socio-economic groups from functional decline and to examine whether the contribution of intellectual abilities is independent of childhood deprivation and low birth weight and other socio-economic and developmental factors in early life. 相似文献5.
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
6.
7.
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
8.
9.
Previous reports in the literature have described correlation of increasing repeat length with severity of the phenotype, in Kennedy syndrome. We describe male siblings with different repeat lengths, with lack of expression of the phenotype in the sibling with the longer repeat length. The phenotype was identical to motor neurone disease. There is variability of expression in Kennedy syndrome and repeat length even in siblings cannot be taken as a conclusive indicator of severity. CAG repeat length cannot be used to predict the natural history of Kennedy disease. The diagnosis of Kennedy syndrome should be considered in male patients presenting with atypical motor neurone disease. 相似文献
10.
Egidio L. Romano res Soyano Ramón F. Montaño Murray Ratcliffe Marilyn Olson Guillermo Suarez Nelly Martínez and Geoffrey Worstey 《Vox sanguinis》1994,66(3):194-199
Thirteen infants, 10 with A-O and 3 with B-O hemolytic disease of the newborn (ABO-HDN), were treated with synthetic A or B blood group trisaccharides (ATS, BTS) which cause dissociation of maternal antibody bound to infant red cells. The clinical outcome was compared with that of a control group of 21 infants treated with phototherapy during the preceding year. Exchange transfusion was required in 2 out of 13 infants in the experimental group and in 7 in the control group. A randomized prospective controlled study is necessary to confirm these results. 相似文献