全文获取类型
收费全文 | 11970篇 |
免费 | 1133篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 178篇 |
儿科学 | 426篇 |
妇产科学 | 249篇 |
基础医学 | 1703篇 |
口腔科学 | 160篇 |
临床医学 | 1231篇 |
内科学 | 2169篇 |
皮肤病学 | 386篇 |
神经病学 | 1279篇 |
特种医学 | 328篇 |
外科学 | 1570篇 |
综合类 | 243篇 |
一般理论 | 5篇 |
预防医学 | 1436篇 |
眼科学 | 173篇 |
药学 | 831篇 |
中国医学 | 6篇 |
肿瘤学 | 765篇 |
出版年
2021年 | 168篇 |
2020年 | 135篇 |
2019年 | 203篇 |
2018年 | 219篇 |
2017年 | 204篇 |
2016年 | 179篇 |
2015年 | 194篇 |
2014年 | 337篇 |
2013年 | 462篇 |
2012年 | 547篇 |
2011年 | 640篇 |
2010年 | 353篇 |
2009年 | 332篇 |
2008年 | 623篇 |
2007年 | 698篇 |
2006年 | 585篇 |
2005年 | 534篇 |
2004年 | 496篇 |
2003年 | 473篇 |
2002年 | 436篇 |
2001年 | 344篇 |
2000年 | 411篇 |
1999年 | 322篇 |
1998年 | 156篇 |
1997年 | 94篇 |
1996年 | 111篇 |
1995年 | 119篇 |
1994年 | 106篇 |
1993年 | 102篇 |
1992年 | 281篇 |
1991年 | 222篇 |
1990年 | 255篇 |
1989年 | 208篇 |
1988年 | 209篇 |
1987年 | 194篇 |
1986年 | 179篇 |
1985年 | 205篇 |
1984年 | 137篇 |
1983年 | 91篇 |
1982年 | 103篇 |
1981年 | 72篇 |
1980年 | 71篇 |
1979年 | 116篇 |
1978年 | 101篇 |
1977年 | 79篇 |
1976年 | 89篇 |
1975年 | 82篇 |
1974年 | 95篇 |
1973年 | 93篇 |
1972年 | 76篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
1.
Harinakshi Sanikini David C. Muller Marisa Sophiea Sabina Rinaldi Antonio Agudo Eric J. Duell Elisabete Weiderpass Kim Overvad Anne Tjønneland Jytte Halkjær Marie-Christine Boutron-Ruault Franck Carbonnel Iris Cervenka Heiner Boeing Rudolf Kaaks Tilman Kühn Antonia Trichopoulou Georgia Martimianaki Anna Karakatsani Valeria Pala Domenico Palli Amalia Mattiello Rosario Tumino Carlotta Sacerdote Guri Skeie Charlotta Rylander María-Dolores Chirlaque López Maria-Jose Sánchez Eva Ardanaz Sara Regnér Tanja Stocks Bas Bueno-de-Mesquita Roel C.H. Vermeulen Dagfinn Aune Tammy Y.N. Tong Nathalie Kliemann Neil Murphy Marc Chadeau-Hyam Marc J. Gunter Amanda J. Cross 《International journal of cancer. Journal international du cancer》2020,146(4):929-942
Obesity has been associated with upper gastrointestinal cancers; however, there are limited prospective data on associations by subtype/subsite. Obesity can impact hormonal factors, which have been hypothesized to play a role in these cancers. We investigated anthropometric and reproductive factors in relation to esophageal and gastric cancer by subtype and subsite for 476,160 participants from the European Prospective Investigation into Cancer and Nutrition cohort. Multivariable hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated using Cox models. During a mean follow-up of 14 years, 220 esophageal adenocarcinomas (EA), 195 esophageal squamous cell carcinomas, 243 gastric cardia (GC) and 373 gastric noncardia (GNC) cancers were diagnosed. Body mass index (BMI) was associated with EA in men (BMI ≥30 vs. 18.5–25 kg/m2: HR = 1.94, 95% CI: 1.25–3.03) and women (HR = 2.66, 95% CI: 1.15–6.19); however, adjustment for waist-to-hip ratio (WHR) attenuated these associations. After mutual adjustment for BMI and HC, respectively, WHR and waist circumference (WC) were associated with EA in men (HR = 3.47, 95% CI: 1.99–6.06 for WHR >0.96 vs. <0.91; HR = 2.67, 95% CI: 1.52–4.72 for WC >98 vs. <90 cm) and women (HR = 4.40, 95% CI: 1.35–14.33 for WHR >0.82 vs. <0.76; HR = 5.67, 95% CI: 1.76–18.26 for WC >84 vs. <74 cm). WHR was also positively associated with GC in women, and WC was positively associated with GC in men. Inverse associations were observed between parity and EA (HR = 0.38, 95% CI: 0.14–0.99; >2 vs. 0) and age at first pregnancy and GNC (HR = 0.54, 95% CI: 0.32–0.91; >26 vs. <22 years); whereas bilateral ovariectomy was positively associated with GNC (HR = 1.87, 95% CI: 1.04–3.36). These findings support a role for hormonal pathways in upper gastrointestinal cancers. 相似文献
2.
3.
C.M. ODonnell N. Black K.C. McCourt M.E. McBrien M. Clarke C.C. Patterson B. Blackwood D.F. McAuley M.O. Shields 《British journal of anaesthesia》2019,122(1):120-130
Background
Perioperative studies of patients following hip fracture have large heterogeneity within their reported outcomes. This study aimed to develop a core outcome set for use in perioperative studies comparing the types of anaesthesia for hip fracture surgery.Methods
The consensus process consisted of a systematic review of the literature, three rounds of a Delphi survey, two consensus webinars, and face-to-face patient meetings.Results
The Delphi participants represented nine stakeholder groups. The numbers of participants completing Rounds 1–3 were 242, 186, and 169, respectively. Seventeen outcomes that met the predefined consensus criteria were considered at two consensus meetings. A final set of 10 core outcomes was agreed: mortality, time from injury to surgery, acute coronary syndrome, hypotension, acute kidney injury, delirium, pneumonia, orthogeriatric input, being out of bed at day 1, and pain.Conclusions
We generated a consensus-based set of core outcomes recommended for use in all perioperative trials evaluating the effects of anaesthesia for hip fracture surgery. An important next step is developing consensus-based consistency on how they should be measured.4.
5.
6.
7.
Felicity M. Bright Georgia K. Chaseling Ollie Jay Nathan B. Morris 《Journal of Science and Medicine in Sport》2019,22(3):371-377
Objectives
To investigate whether the exercise performance benefits with neck cooling in the heat are attributable to neck-specific cooling, general body cooling, a cooler site-specific thermal perception or a combination of the above.Design
Counter-balanced crossover design.Methods
Twelve healthy participants cycled in the heat (34 °C, 30% relative humidity), at a power output (PO) self-selected to maintain a fixed rating of perceived exertion (RPE) of 16. Each participant underwent four experimental trials: no cooling (CON), neck cooling (NEC), abdominal cooling (ABD), or neck cooling with menthol (MEN). Participants cycled for 90 min or until their workload reduced by <70% of their initial PO. Changes in PO, rectal temperature (Tre), mean skin temperature (Tsk), whole-body thermal sensation (TSwb) and thermal sensation of the neck (TSneck) were recorded throughout.Results
The mean reduction in PO throughout exercise was similar (p = 0.431) for CON (175 ± 10 W), NEC (176 ±12 W), ABD (172 ± 13 W) and MEN (174 ± 12 W). The ΔTre at the end of exercise was similar (p = 0.874) for CON (0.83 ± 0.5 °C), NEC (0.85 ± 0.5 °C), ABD (0.82 ± 0.5 °C) and MEN (0.81 ± 0.5 °C). TSwb was cooler (p < 0.013) in MEN (125 ± 8 mm) compared to CON (146 ± 19 mm), NEC (135 ± 11 mm) and ABD (141 ± 16 mm).Conclusions
No differences in exercise performance or thermal strain were observed in any of the cooling trials compared to the CON trial, despite significantly cooler TSwb values in the MEN and NEC trials compared to the CON trial. These findings differ from previous observations and highlight that the benefit of neck cooling may be situation dependent. 相似文献8.
Paulo Roberto Lima Falco do Vale Sheila Cerqueira Hudson P. Santos Beth P. Black Evanilda Souza de Santana Carvalho 《Nursing inquiry》2019,26(1)
The rapidly increasing number of cases of Zika virus and limited understanding of its congenital sequelae (e.g., microcephaly) led to stories of fear and uncertainty across social media and other mass communication networks. In this study, we used techniques generic to netnography, a form of ethnography, using Internet‐based computer‐mediated communications as a source of data to understand the experience and perceptions of families with infants diagnosed with Zika‐related microcephaly. We screened 27 YouTube? videos published online between October 2015 and July 2016, during which the Zika epidemic started, peaked, and declined. We identified three themes: (a) experiencing the news of a diagnosis of Zika‐associated microcephaly; (b) experiencing feelings and expectations of the ‘imperfect’ child; and (c) seeking to understand microcephaly to care for the child. We found that families experienced distressing feelings of shock, sadness, hopelessness, and pain, while dealing with emerging and sometimes conflicting information being transmitted by news outlets, uncertainty about the child's health, and healthcare providers’ lack of clarity to guide the family members. The ‘unknown’ factor of ZIKA was an additional stressful factor in the experience of the families. 相似文献
9.
Angela M. Auriat Jennifer K. Ferris Sue Peters Joel Ramirez Sandra E. Black Claudia Jacova Lara A. Boyd 《Journal of stroke and cerebrovascular diseases》2019,28(2):381-388
Background and Aims
In addition to overt stroke lesions, co-occurring covert lesions, including white matter hyperintensities (WMH) and covert lacunar infarcts (CLI), contribute to poststroke outcome. The purpose of this study was to examine the relationship between covert lesions, and motor and cognitive outcomes in individuals with chronic stroke.Methods
Volumetric quantification of clinically overt strokes, covert lesions (periventricular and deep: pWMH, dWMH, pCLI, dCLI), ventricular and sulcal CSF (vCSF, sCSF), and normal appearing white (NAWM) and gray matter (NAGM) was performed using structural magnetic resonance imaging. We assessed motor impairment and function, and global cognition, memory, and other cognitive domains. When correlation analysis identified more than one MR parameter relating to stroke outcomes, we used regression modeling to identify which factor had the strongest impact.Results
Neuropsychological and brain imaging data were collected from 30 participants at least 6 months following a clinically diagnosed stroke. Memory performance related to vCSF (r = ?0.52, P = .004). The strongest predictor of nonmemory domains was pCLI (r2 = 0.28, P = .004). Motor impairment and function were most strongly predicted by the volume of stroke and NAWM (r2 = 0.36; P = .001), and dWMH (r2 = 0.39; P = .001) respectively.Conclusions
Covert lesion type and location have important consequences for post-stroke cognitive and motor outcome. Limiting the progression of covert lesions in aging populations may enhance the degree of recovery post-stroke. 相似文献10.
Shane R. Stecklein Simona F. Shaitelman Gildy V. Babiera Isabelle Bedrosian Dalliah M. Black Matthew T. Ballo Isadora Arzu Eric A. Strom Valerie K. Reed Tomas Dvorak Benjamin D. Smith Wendy A. Woodward Karen E. Hoffman Pamela J. Schlembach Steve M. Kirsner Christopher L. Nelson Jinzhong Yang William Guerra Elizabeth S. Bloom 《Practical radiation oncology》2019,9(1):e4-e13