全文获取类型
收费全文 | 1275篇 |
免费 | 349篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 31篇 |
妇产科学 | 21篇 |
基础医学 | 81篇 |
口腔科学 | 10篇 |
临床医学 | 467篇 |
内科学 | 243篇 |
皮肤病学 | 6篇 |
神经病学 | 307篇 |
特种医学 | 70篇 |
外科学 | 202篇 |
综合类 | 5篇 |
预防医学 | 78篇 |
眼科学 | 5篇 |
药学 | 30篇 |
中国医学 | 1篇 |
肿瘤学 | 64篇 |
出版年
2024年 | 5篇 |
2023年 | 51篇 |
2022年 | 22篇 |
2021年 | 37篇 |
2020年 | 51篇 |
2019年 | 38篇 |
2018年 | 72篇 |
2017年 | 106篇 |
2016年 | 89篇 |
2015年 | 106篇 |
2014年 | 106篇 |
2013年 | 132篇 |
2012年 | 54篇 |
2011年 | 47篇 |
2010年 | 83篇 |
2009年 | 116篇 |
2008年 | 57篇 |
2007年 | 44篇 |
2006年 | 38篇 |
2005年 | 30篇 |
2004年 | 30篇 |
2003年 | 23篇 |
2002年 | 16篇 |
2001年 | 28篇 |
2000年 | 20篇 |
1999年 | 15篇 |
1998年 | 37篇 |
1997年 | 26篇 |
1996年 | 29篇 |
1995年 | 19篇 |
1994年 | 14篇 |
1993年 | 6篇 |
1992年 | 13篇 |
1991年 | 14篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 7篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1972年 | 1篇 |
1964年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有1634条查询结果,搜索用时 15 毫秒
11.
Stacy Schantz Wilkins PhD Rebecca J. Melrose PhD Katherine S. Hall PhD Erin Blanchard MS Steven C. Castle MD Teresa Kopp PT MBA Leslie I. Katzel MD PhD Alice Holder MHS PT Neil Alexander MD Michelle K.S. McDonald BA OT Arti Tayade MD CMD HMDC Daniel E. Forman MD Lauren M. Abbate MD PhD Rebekah Harris PT DPT PhDc Willy M. Valencia MD Miriam C. Morey PhD Cathy C. Lee MD 《Journal of the American Geriatrics Society》2021,69(4):1045-1050
12.
Shahar Shmuel PhD Virginia Pate MS Marc J. Pepin PharmD BCPS BCGP Janine C. Bailey PharmD BCPS Yvonne M. Golightly PT MS PhD Laura C. Hanson MD MPH Til Stürmer MD MPH PhD Rebecca B. Naumann PhD Danijela Gnjidic PhD Jennifer L. Lund PhD 《Journal of the American Geriatrics Society》2021,69(11):3212-3224
13.
David A. Ganz MD PhD Anita H. Yuan PhD MPH Erich J. Greene PhD Nancy K. Latham PT PhD Katy Araujo MPH Albert L. Siu MD MSPH Jay Magaziner MSHyg PhD Jerry H. Gurwitz MD Albert W. Wu MD MPH Neil B. Alexander MD Robert B. Wallace MD MSc Susan L. Greenspan MD Jeremy Rich DPM Elena Volpi MD PhD Stephen C. Waring DVM PhD Patricia C. Dykes RN PhD MA Fred Ko MD MS Neil M. Resnick MD Siobhan K. McMahon PhD MPH GNP Shehzad Basaria MD Rixin Wang PhD Charles Lu MS Denise Esserman PhD James Dziura PhD Michael E. Miller PhD Thomas G. Travison PhD Peter Peduzzi PhD Shalender Bhasin MB BS David B. Reuben MD Thomas M. Gill MD 《Journal of the American Geriatrics Society》2022,70(11):3221-3229
14.
15.
Asymptomatic human carriers of Leishmania chagasi 总被引:6,自引:0,他引:6
Costa CH Stewart JM Gomes RB Garcez LM Ramos PK Bozza M Satoskar A Dissanayake S Santos RS Silva MR Shaw JJ David JR Maguire JH 《The American journal of tropical medicine and hygiene》2002,66(4):334-337
In Brazil, programs based on elimination of infected dogs have not curtailed the spread of visceral leishmaniasis (VL), suggesting that other reservoirs of infection exist. Persons with active VL can infect the sand fly vector, but in endemic areas, persons with asymptomatic infections, whose infectivity to sand flies is unknown, are far more numerous. In this study, a polymerase chain reaction-based assay detected kinetoplast DNA of Leishmania chagasi in the blood of eight of 108 asymptomatic persons living with patients with recently diagnosed VL. These eight persons had low or unmeasurable levels of IgG antibodies to Leishmania, demonstrating the insensitivity of serology for subclinical infection. All eight persons had positive leishmanin skin test results, as did 70% of persons living in households of persons with active VL. Even if a small proportion of such asymptomatic persons are infective to sand flies, they represent a formidable reservoir of infection in endemic areas. 相似文献
16.
17.
Fernando G. Zampieri Theodore J. Iwashyna Elizabeth M. Viglianti Leandro U. Taniguchi William N. Viana Roberto Costa Thiago D. Corrêa Carlos Eduardo N. Moreira Marcelo O. Maia Giulliana M. Moralez Thiago Lisboa Marcus A. Ferez Carlos Eduardo F. Freitas Clayton B. de Carvalho Bruno F. Mazza Mariza F. A. Lima Grazielle V. Ramos Aline R. Silva Fernando A. Bozza Jorge. I. F. Salluh Marcio Soares for the ORCHESTRA Study Investigators 《Intensive care medicine》2018,44(9):1512-1520
Purpose
Frail patients are known to experience poor outcomes. Nevertheless, we know less about how frailty manifests itself in patients’ physiology during critical illness and how it affects resource use in intensive care units (ICU). We aimed to assess the association of frailty with short-term outcomes and organ support used by critically ill patients.Methods
Retrospective analysis of prospective collected data from 93 ICUs in Brazil from 2014 to 2015. We assessed frailty using the modified frailty index (MFI). The primary outcome was in-hospital mortality. Secondary outcomes were discharge home without need for nursing care, ICU and hospital length of stay (LOS), and utilization of ICU organ support and transfusion. We used mixed logistic regression and competing risk models accounting for relevant confounders in outcome analyses.Results
The analysis consisted of 129,680 eligible patients. There were 40,779 (31.4%) non-frail (MFI?=?0), 64,407 (49.7%) pre-frail (MFI?=?1–2) and 24,494 (18.9%) frail (MFI?≥?3) patients. After adjusted analysis, frailty was associated with higher in-hospital mortality (OR 2.42, 95% CI 1.89–3.08), particularly in patients admitted with lower SOFA scores. Frail patients were less likely to be discharged home (OR 0.36, 95% CI 0.54–0.79) and had higher hospital and ICU LOS than non-frail patients. Use of all forms of organ support (mechanical ventilation, non-invasive ventilation, vasopressors, dialysis and transfusions) were more common in frail patients and increased as MFI increased.Conclusions
Frailty, as assessed by MFI, was associated with several patient-centered endpoints including not only survival, but also ICU LOS and organ support.18.
Cantini F Salvarani C Olivieri I Niccoli L Padula A Macchioni L Boiardi L Ciancio G Mastrorosato M Rubini F Bozza A Zanfranceschi G 《The Journal of rheumatology》2001,28(5):1049-1055
OBJECTIVE: Magnetic resonance imaging (MRI) showed that subacromial/subdeltoid bursitis is the most frequent shoulder lesion in polymyalgia rheumatica (PMR). We evaluated whether shoulder ultrasonography (US) was as effective as MRI in the detection of this lesion and assessed the sensitivity and specificity of bilateral subacromial/subdeltoid bursitis in the diagnosis of PMR. METHODS: A case-control study of 57 consecutive case patients with untreated PMR and 114 controls seen over a 6 month period in 3 secondary referral rheumatology centers. Control patients consisted of the next 2 consecutive patients with bilateral shoulder aching and stiffness observed after the case patient. In all case and control patients the glenohumeral joint space, bursae, and long head biceps tendon were assessed by bilateral shoulder US. The first 24 case patients were also examined by bilateral shoulder MRI. RESULTS: US showed subacromial/subdeltoid bursitis in 55/57 (96%) patients with PMR and in 25/114 (22%) controls (p < 0.001). The lesion was bilateral in 53/55 (96%) case patients and in 1/25 (4%) controls (p < 0.001). The frequency of glenohumeral joint synovitis and biceps tenosynovitis did not differ significantly between case patients and controls. In 100% of case patients MRI showed subacromial/subdeltoid bursitis confirming US findings. The sonographic evidence of bilateral bursitis had a sensitivity of 92.9%, specificity of 99. 1%, and positive predictive value of 98. 1% for the diagnosis of PMR. CONCLUSION: US and MRI were equally effective in confirming bilateral subacromial and subdeltoid bursitis in PMR. This finding, in view of its high sensitivity and specificity, could be used as a new diagnostic criterion for PMR. 相似文献
19.
20.