全文获取类型
收费全文 | 927104篇 |
免费 | 67611篇 |
国内免费 | 1348篇 |
专业分类
耳鼻咽喉 | 12957篇 |
儿科学 | 24314篇 |
妇产科学 | 23273篇 |
基础医学 | 132199篇 |
口腔科学 | 28248篇 |
临床医学 | 80142篇 |
内科学 | 182126篇 |
皮肤病学 | 19302篇 |
神经病学 | 71849篇 |
特种医学 | 36815篇 |
外国民族医学 | 79篇 |
外科学 | 151904篇 |
综合类 | 18016篇 |
现状与发展 | 1篇 |
一般理论 | 234篇 |
预防医学 | 61330篇 |
眼科学 | 21257篇 |
药学 | 72417篇 |
3篇 | |
中国医学 | 2119篇 |
肿瘤学 | 57478篇 |
出版年
2018年 | 8989篇 |
2017年 | 7044篇 |
2016年 | 7780篇 |
2015年 | 8872篇 |
2014年 | 12008篇 |
2013年 | 17516篇 |
2012年 | 24133篇 |
2011年 | 25081篇 |
2010年 | 14830篇 |
2009年 | 14295篇 |
2008年 | 24648篇 |
2007年 | 25742篇 |
2006年 | 26561篇 |
2005年 | 25498篇 |
2004年 | 24611篇 |
2003年 | 23593篇 |
2002年 | 23145篇 |
2001年 | 54694篇 |
2000年 | 56458篇 |
1999年 | 46776篇 |
1998年 | 10274篇 |
1997年 | 8989篇 |
1996年 | 9134篇 |
1995年 | 8886篇 |
1994年 | 8265篇 |
1993年 | 7574篇 |
1992年 | 35463篇 |
1991年 | 33929篇 |
1990年 | 32736篇 |
1989年 | 31863篇 |
1988年 | 28984篇 |
1987年 | 28254篇 |
1986年 | 26281篇 |
1985年 | 25145篇 |
1984年 | 17816篇 |
1983年 | 15120篇 |
1982年 | 7764篇 |
1981年 | 6737篇 |
1979年 | 15761篇 |
1978年 | 10586篇 |
1977年 | 9030篇 |
1976年 | 7865篇 |
1975年 | 8617篇 |
1974年 | 10458篇 |
1973年 | 9853篇 |
1972年 | 9357篇 |
1971年 | 8849篇 |
1970年 | 8417篇 |
1969年 | 7918篇 |
1968年 | 7202篇 |
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
101.
102.
Marine n-3 polyunsaturated fatty acids (PUFAs) may improve cardiovascular, renal, and mental health. No previous trial has investigated the effects of marine n-3 PUFA supplementation on quality of life (QoL) indices after renal transplant.
Methods
In this trial, 132 renal transplant recipients were randomized to receive daily either 2.6 g of marine n-3 PUFAs or an equivalent dose of olive oil (controls) on top of standard care for 44 weeks. We used a Short Form 36 (SF-36) questionnaire at baseline (8 weeks post transplant) and at the end of the study (1 year after transplant) to assess QoL. Results were expressed as net change (Δ) in SF-36 individual and composite mental and physical scores during follow-up.Results
We found no improvement of Δ SF-36 individual or composite scores after marine n-3 PUFA supplementation compared with controls. In per-protocol analysis, patients who received marine n-3 PUFAs had a Δ emotional role function (mean, 17% [SD, 50%] vs mean, 3% [SD, 37%]; P = .11). In addition, plasma marine n-3 PUFA levels showed a weak but statistically significant correlation with Δ composite mental function score (r = .18; P =? .04).Conclusion
Marine n-3 PUFA supplementation did not improve QoL after renal transplant. 相似文献103.
P. Rostin B. J. Teja S. Friedrich S. Shaefi K. R. Murugappan S. K. Ramachandran T. T. Houle M. Eikermann 《Anaesthesia》2019,74(4):457-467
It is unclear which criteria should be used to define readiness for tracheal extubation in the operating theatre. We studied the effects of desaturation in the operating theatre immediately after tracheal extubation on long-term outcomes. Performing a pre-specified, retrospective analysis of 71,025 cases involving previously independent adults undergoing non-cardiac surgery, we evaluated the association between desaturation events (oxygen saturation < 90%) within 10 min of tracheal extubation and adverse discharge (to a skilled nursing facility or long-term care facility). A total of 404 (12.3%) cases with, and 5035 (7.4%) cases without, early postoperative desaturation had an adverse discharge. Early postoperative desaturation was associated with higher odds of being discharged to a nursing facility (adjusted odds ratio 1.36 (95%CI 1.20–1.54); p < 0.001). Increased duration of desaturation augmented the effect (p for trend < 0.001). Desaturation was associated with a higher risk of respiratory, renal and cardiovascular complications as well as increased duration of hospital stay, postoperative intensive care unit admission frequency and cost. Several modifiable factors were associated with desaturation including: high intra-operative long-acting opioid administration; high neostigmine dose; high intra-operative inspired oxygen concentration; and low oxygen delivery immediately before tracheal extubation. There was substantial provider variability between anaesthetists in the incidence of postoperative desaturation unexplained by patient- and procedure-related factors. Early postoperative desaturation is a potentially preventable complication associated with a higher risk of adverse discharge disposition. Anaesthetists may consider developing guidelines to define tracheal extubation readiness that contain postoperative desaturation as an adverse outcome after tracheal extubation. 相似文献
104.
105.
Li Dong Mari Nygård Nathalie C. Støer Ole Klungsøyr Bo T. Hansen 《International journal of cancer. Journal international du cancer》2023,153(2):399-406
Human papillomavirus (HPV) vaccine effectiveness may differ between settings. Here we present the first real-world effectiveness study of HPV vaccination on high-grade cervical lesions from Norway, among women who received HPV vaccine outside the routine program. We performed an observational study of all Norwegian women born 1975 to 1996 and retrieved individual data from nationwide registries on HPV vaccination status and incidence of histologically verified high-grade cervical neoplasia during 2006 to 2016. We estimated the incidence rate ratio (IRR) and 95% confidence intervals (CI) for vaccination vs no vaccination by Poisson regression stratified by age at vaccination <20 years and ≥20 years. The cohort consisted of 832 732 women, of which 46 381 (5.6%) received at least one dose of HPV vaccine by the end of 2016. The incidence rate of cervical intraepithelial neoplasia grade 2 or worse (CIN2+) increased with age regardless of vaccination status and was highest at age 25 to 29, at 637/100 000 among unvaccinated women, 487/100 000 among women vaccinated before age 20 and 831/100 000 among women vaccinated at age 20 or older. The adjusted IRR of CIN2+ between vaccinated and unvaccinated women was 0.62 (95% CI: 0.46-0.84) for women vaccinated below age 20, and 1.22 (95% CI: 1.03-1.43) for women vaccinated at age 20 or older. These findings indicate that HPV vaccination among women too old to be eligible for routine HPV vaccination is effective among women who are vaccinated below age 20 but may not have the desired impact among women who are vaccinated at age 20 or older. 相似文献
106.
Braçe Olta Duncan Dustin T. Correa-Fernández José Garrido-Cumbrera Marco 《Sleep & breathing》2022,26(1):389-396
Sleep and Breathing - The purpose of the present study was to evaluate the association of sleep duration and mental health among the general population. A cross-sectional study was carried out with... 相似文献
107.
108.
Bergam S. Harrison A. D. Benghu N. Khumalo S. Tesfay N. Exner T. Miller L. Dolezal C. Hanass-Hancock J. Hoffman S. 《AIDS and behavior》2022,26(9):2881-2890
AIDS and Behavior - Daily oral pre-exposure prophylaxis (PrEP) offers effective HIV prevention. In South Africa, PrEP is publicly available, but use among young women remains low. We explored young... 相似文献
109.
S. Harrogate J. Barnes K. Thomas A. Isted G. Kunst S. Gupta S. Rudd T. Banerjee R. Hinchliffe R. Mouton 《Anaesthesia》2023,78(11):1393-1408
Tobacco smoking is associated with a substantially increased risk of postoperative complications. The peri-operative period offers a unique opportunity to support patients to stop tobacco smoking, avoid complications and improve long-term health. This systematic review provides an up-to-date summary of the evidence for tobacco cessation interventions in surgical patients. We conducted a systematic search of randomised controlled trials of tobacco cessation interventions in the peri-operative period. Quantitative synthesis of the abstinence outcomes data was by random-effects meta-analysis. The primary outcome of the meta-analysis was abstinence at the time of surgery, and the secondary outcome was abstinence at 12 months. Thirty-eight studies are included in the review (7310 randomised participants) and 26 studies are included in the meta-analysis (5969 randomised participants). Studies were pooled for subgroup analysis in two ways: by the timing of intervention delivery within the peri-operative period and by the intensity of the intervention protocol. We judged the quality of evidence as moderate, reflecting the degree of heterogeneity and the high risk of bias. Overall, peri-operative tobacco cessation interventions increased successful abstinence both at the time of surgery, risk ratio (95%CI) 1.48 (1.20–1.83), number needed to treat 7; and 12 months after surgery, risk ratio (95%CI) 1.62 (1.29–2.03), number needed to treat 9. More work is needed to inform the design and optimal delivery of interventions that are acceptable to patients and that can be incorporated into contemporary elective and urgent surgical pathways. Future trials should use standardised outcome measures. 相似文献