全文获取类型
收费全文 | 7182篇 |
免费 | 640篇 |
国内免费 | 17篇 |
专业分类
耳鼻咽喉 | 91篇 |
儿科学 | 239篇 |
妇产科学 | 104篇 |
基础医学 | 928篇 |
口腔科学 | 142篇 |
临床医学 | 946篇 |
内科学 | 1222篇 |
皮肤病学 | 84篇 |
神经病学 | 899篇 |
特种医学 | 286篇 |
外国民族医学 | 1篇 |
外科学 | 932篇 |
综合类 | 162篇 |
一般理论 | 7篇 |
预防医学 | 930篇 |
眼科学 | 156篇 |
药学 | 366篇 |
中国医学 | 7篇 |
肿瘤学 | 337篇 |
出版年
2022年 | 44篇 |
2021年 | 110篇 |
2020年 | 83篇 |
2019年 | 110篇 |
2018年 | 148篇 |
2017年 | 110篇 |
2016年 | 92篇 |
2015年 | 82篇 |
2014年 | 157篇 |
2013年 | 217篇 |
2012年 | 384篇 |
2011年 | 339篇 |
2010年 | 178篇 |
2009年 | 166篇 |
2008年 | 291篇 |
2007年 | 331篇 |
2006年 | 276篇 |
2005年 | 313篇 |
2004年 | 324篇 |
2003年 | 311篇 |
2002年 | 241篇 |
2001年 | 224篇 |
2000年 | 236篇 |
1999年 | 196篇 |
1998年 | 96篇 |
1997年 | 74篇 |
1996年 | 66篇 |
1995年 | 123篇 |
1994年 | 151篇 |
1993年 | 125篇 |
1992年 | 204篇 |
1991年 | 177篇 |
1990年 | 140篇 |
1989年 | 162篇 |
1988年 | 156篇 |
1987年 | 115篇 |
1986年 | 119篇 |
1985年 | 120篇 |
1984年 | 92篇 |
1983年 | 81篇 |
1982年 | 55篇 |
1979年 | 77篇 |
1978年 | 43篇 |
1977年 | 50篇 |
1976年 | 41篇 |
1974年 | 54篇 |
1973年 | 61篇 |
1972年 | 55篇 |
1971年 | 43篇 |
1969年 | 48篇 |
排序方式: 共有7839条查询结果,搜索用时 0 毫秒
101.
Joseph R. Habib Benedict Kinny-Köster Floortje van Oosten Ammar A. Javed John L. Cameron Kelly J. Lafaro Richard A. Burkhart William R. Burns Jin He Elizabeth D. Thompson Elliot K. Fishman Christopher L. Wolfgang 《Surgery》2021,169(5):1026-1031
Most patients diagnosed with pancreatic cancer are classified as nonoperative candidates based on the contemporary guidelines of resectability. The advent of more potent control of systemic disease using neoadjuvant chemotherapy has enabled more aggressive operative interventions. In our multidisciplinary practice, patients with Stage III, locally advanced pancreatic cancer and superior mesenteric artery (SMA) encasement are now carefully triaged with high quality, preoperative imaging to determine if they can be considered candidates for operative resection with periadventitial dissection of the SMA. Patients displaying a “halo sign,” where the encased SMA remains fully patent and free from arterial invasion, are now candidates for SMA periadventitial dissection. This procedure involves the surgical stripping of the infiltrated neurolymphatic tissue off the SMA leaving behind a bare “skeletonized artery.” Alternatively, the “string sign” involving the SMA confers a more likely case of arterial invasion, where a complete oncologic resection cannot be achieved successfully. This method of patient selection in case of SMA involvement abandons the traditional metrics of circumferential degrees of the arterial encasement to guide surgical decisions. Our institutional approach has allowed us to meaningfully expand our operative methods of resection with the potential for improved longitudinal outcomes to pancreatic cancer patients who were deprived historically from the more effective and possibly curative treatment. 相似文献
102.
103.
Camden P. Bay Steven M. Levy Kathleen F. Janz Brian J. Smith John R. Shaffer Mary L. Marazita Trudy L. Burns 《Journal of clinical densitometry》2021,24(1):44-54
The foundation for osteoporosis risk is, in part, established during childhood, adolescence, and young adulthood, all periods of development when bone mass is acquired rapidly. The relative quantity of bone mass accrued is influenced by both lifestyle and genetic factors, although the genetic component is not yet well understood. The purpose of this study was to use a genome-wide association (GWA) analysis to discover single nucleotide polymorphisms (SNPs) associated with: (1) the sex-specific hip bone mineral content at approximately the age of 19 when the amount of bone accrued is near its peak; and (2) the sex-specific rate of hip bone mineral content accrual during the adolescent growth spurt. The Iowa Bone Development Study, a longitudinal cohort study exploring bone health in children, adolescents, and young adults was the source of data. From this cohort, n = 364 (190 females, 174 males) participants were included in GWA analyses to address (1) and n = 258 participants (125 females and 133 males) were included in GWA analyses to address (2). Twenty SNPS were detected having p < 1.0 × 10?5. Of most biologic relevance were 2 suggestive SNPs (rs2051756 and rs2866908) detected in an intron of the DKK2 gene through the GWA analysis that explored peak bone mass in females. 相似文献
104.
Abdullah Al-Mitwalli Grigorios Kyriazis Omar El-Taji Elizabeth Chandra Wearmouth Deborah Phillipa Burns Youssef Fady Matthew Simms Smith Nicholas 《Current Urology》2021,15(2):115
Background:Urosepsis is a recognized complication of transrectal ultrasound-guided prostate biopsy (TRUS-Bx). Pre-biopsy rectal swabs have been used to identify patients with microorganisms in the rectal flora resistant to the conventionally used empirical prophylaxis. The transperineal route of biopsy (TP-Bx) has a lower complication risk but comes at an increased cost.Materials and methods:Retrospective cohort study including patients undergoing prostate biopsies between October/2015 and April/2018. The intervention cohort, a rectal swab was performed, the result of which dictated the biopsy route; TRUS-Bx against TP-Bx. TP-Bx for patients with fluoroquinolone resistance or extended-spectrum β-lactamase. The control cohort underwent TRUS without a rectal swab receiving empirical antibiotics—oral ciprofloxacin and intravenous gentamicin.Results:Total 1000 patients were included in which 500 underwent a swab, 14 (2.8%) developed post-TRUS biopsy infective complications with 3 having positive bacteremia (0.6%); 500 had no swab, 47 (9.4%) developed post-TRUS biopsy infective complications with 22 (4.4%, p < 0.05) having positive bacteremia. Three patients (0.6%) of patients who underwent swab developed urinary tract infection symptoms whilst 12 (2.4%) had urinary tract infection in the control group. In those patients that underwent a swab, 14 required hospitalization with mean length of stay of 2.5 days versus 43 patients of the control with 3.6 days. Cost analysis concluded savings of this strategy was £18,711.Conclusions:We have demonstrated a protocol that reserves template biopsies for higher risk patients and can significantly reduce sepsis and other infectious complication rates whilst also proving to be a cost-efficient strategy. We recommend that units not utilizing rectal swabs to uncover the fluoroquinolone resistance rate by introducing them. We advocate units that already utilize rectal swabs, to introduce transperineal biopsy for their higher risk patients. 相似文献
105.
106.
Kramer GH Burns LC Meyerhof DP 《The Canadian journal of medical radiation technology / CAMRT》1993,24(4):157-160
This article is the first part of a five-part series covering various aspects of occupational thyroid monitoring. The Canadian National Calibration Reference Centre for In-Vivo Monitoring conducts a thyroid inter-comparison programme that now includes more than 100 facilities. The scope of the programme, begun in 1988, has greatly expanded in the last two years following a considerable effort to locate and inform facilities. This article presents the details of the programme, its results, and the lessons learned. Subsequent articles will discuss sources of errors, methodology, instrumental configuration, and counting geometry optimization. 相似文献
107.
108.
109.
110.