全文获取类型
收费全文 | 49024篇 |
免费 | 3111篇 |
国内免费 | 238篇 |
专业分类
耳鼻咽喉 | 500篇 |
儿科学 | 922篇 |
妇产科学 | 626篇 |
基础医学 | 6406篇 |
口腔科学 | 1089篇 |
临床医学 | 5166篇 |
内科学 | 10813篇 |
皮肤病学 | 987篇 |
神经病学 | 5629篇 |
特种医学 | 2501篇 |
外科学 | 8227篇 |
综合类 | 296篇 |
一般理论 | 13篇 |
预防医学 | 2282篇 |
眼科学 | 644篇 |
药学 | 2948篇 |
中国医学 | 70篇 |
肿瘤学 | 3254篇 |
出版年
2023年 | 432篇 |
2022年 | 690篇 |
2021年 | 1416篇 |
2020年 | 841篇 |
2019年 | 1268篇 |
2018年 | 1435篇 |
2017年 | 1125篇 |
2016年 | 1346篇 |
2015年 | 1555篇 |
2014年 | 1967篇 |
2013年 | 2426篇 |
2012年 | 3901篇 |
2011年 | 3931篇 |
2010年 | 2340篇 |
2009年 | 2104篇 |
2008年 | 3351篇 |
2007年 | 3433篇 |
2006年 | 3168篇 |
2005年 | 3122篇 |
2004年 | 2763篇 |
2003年 | 2645篇 |
2002年 | 2381篇 |
2001年 | 437篇 |
2000年 | 332篇 |
1999年 | 402篇 |
1998年 | 478篇 |
1997年 | 362篇 |
1996年 | 288篇 |
1995年 | 222篇 |
1994年 | 221篇 |
1993年 | 164篇 |
1992年 | 143篇 |
1991年 | 130篇 |
1990年 | 98篇 |
1989年 | 90篇 |
1988年 | 93篇 |
1987年 | 60篇 |
1986年 | 72篇 |
1985年 | 69篇 |
1984年 | 102篇 |
1983年 | 80篇 |
1982年 | 75篇 |
1981年 | 59篇 |
1980年 | 55篇 |
1979年 | 49篇 |
1978年 | 47篇 |
1977年 | 50篇 |
1976年 | 47篇 |
1975年 | 48篇 |
1974年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
Clinical Epileptology - Der plötzliche unerwartete Tod stellt eine seltene, aber schwerwiegende Komplikation für Epilepsiepatienten dar. Das Risiko hierfür ist u. a. nachts und... 相似文献
24.
Gregers Mads Christian Tofte Mikkelsen Søren Lindvig Katrine Prier Brøchner Anne Craveiro 《Neurocritical care》2020,33(1):273-282
Neurocritical Care - For years, the use of ketamine as an anesthetic to patients suffering from acute brain injury has been debated because of its possible deleterious effects on the cerebral... 相似文献
25.
26.
Rosario Fernández-Plata Rogelio Pérez-Padilla Rodrigo Del Río-Hidalgo Cecilia García-Sancho Laura Gochicoa-Rangel Christian Rodríguez-Hernández Luis Torre-Bouscoulet David Martínez-Briseño 《Archivos de bronconeumología》2019,55(10):513-518
IntroductionPeople with Down syndrome (DS) have high respiratory morbidity, evaluating their respiratory health with standardized, objective tests is desirable. Thus, the objective of this study was to evaluate the technical quality of Pulmonary Function Tests (PFTs) to determine which ones are most suitable for this population.MethodsParticipants included children, teenagers and adults with DS, 5 years of age or older (n = 302). The technical quality of the impulse oscillometry system (IOS), forced spirometry, lung-diffusing capacity for carbon monoxide (DLCO), and 6-min walk test (6MWT) were analyzed by age group. Capnography and pulse oximetry were included in the study. Technical quality was determined on the basis of current international PFTs standards.ResultsFifty-one percent of participants were males. A total of 184 participants (71%) who completed the IOS fulfilled the quality criteria, while 210 (70%) completed the 6MWT. Performance on forced spirometry and DLCO was poor. All pulse oximetries and 96% percent heart rates obtained had good quality, but exhaled carbon dioxide (PetCO2) and respiratory rate (RR) showed deficient repeatability.ConclusionsIOS appears to be the most reliable instrument for evaluating lung mechanics in individuals with DS. 相似文献
27.
Marie Warrer Petersen Tine Sylvest Meyhoff Marie Helleberg Maj-Brit Nørregaard Kjær Anders Granholm Carl Johan Steensen Hjortsø Thomas Steen Jensen Morten Hylander Møller Peter Buhl Hjortrup Mik Wetterslev Gitte Kingo Vesterlund Lene Russell Vibeke Lind Jørgensen Klaus Tjelle Thomas Benfield Charlotte Suppli Ulrik Anne Sofie Andreasen Thomas Mohr Morten H. Bestle Lone Musaeus Poulsen Mette Friberg Hitz Thomas Hildebrandt Lene Surland Knudsen Anders Møller Christoffer Grant Sølling Anne Craveiro Brøchner Bodil Steen Rasmussen Henrik Nielsen Steffen Christensen Thomas Strøm Maria Cronhjort Rebecka Rubenson Wahlin Stephan Jakob Luca Cioccari Balasubramanian Venkatesh Naomi Hammond Vivekanand Jha Sheila Nainan Myatra Christian Gluud Theis Lange Anders Perner 《Acta anaesthesiologica Scandinavica》2020,64(9):1365-1375
Introduction
Severe acute respiratory syndrome coronavirus-2 has caused a pandemic of coronavirus disease (COVID-19) with many patients developing hypoxic respiratory failure. Corticosteroids reduce the time on mechanical ventilation, length of stay in the intensive care unit and potentially also mortality in similar patient populations. However, corticosteroids have undesirable effects, including longer time to viral clearance. Clinical equipoise on the use of corticosteroids for COVID-19 exists.Methods
The COVID STEROID trial is an international, randomised, stratified, blinded clinical trial. We will allocate 1000 adult patients with COVID-19 receiving ≥10 L/min of oxygen or on mechanical ventilation to intravenous hydrocortisone 200 mg daily vs placebo (0.9% saline) for 7 days. The primary outcome is days alive without life support (ie mechanical ventilation, circulatory support, and renal replacement therapy) at day 28. Secondary outcomes are serious adverse reactions at day 14; days alive without life support at day 90; days alive and out of hospital at day 90; all-cause mortality at day 28, day 90, and 1 year; and health-related quality of life at 1 year. We will conduct the statistical analyses according to this protocol, including interim analyses for every 250 patients followed for 28 days. The primary outcome will be compared using the Kryger Jensen and Lange test in the intention to treat population and reported as differences in means and medians with 95% confidence intervals.Discussion
The COVID STEROID trial will provide important evidence to guide the use of corticosteroids in COVID-19 and severe hypoxia.28.
Martin Freesmeyer Christian Kühnel Falk Gühne Philipp Seifert 《Journal of ultrasound in medicine》2019,38(12):3311-3319
Fine‐needle aspiration cytology using a novel ultrasound needle guidance system on the basis of standard needle magnetization was consecutively performed in 30 (15 in‐plane and 15 out‐of‐plane) suspicious thyroid nodules. Nondedicated, commercially available needles were used. The technical effectiveness and safety of the system were satisfying; system failures were observed in 2 cases. The needle tip could be (at least occasionally) visualized inside the thyroid nodule in 96%, and the subjective procedure ratings were excellent in 57%. The out‐of‐plane technique was significantly superior in both respects (P = .021 and .027, respectively). Standard needle magnetization ultrasound needle guidance was easy to apply and cost‐effective and has the potential to improve fine‐needle aspiration cytology performance. 相似文献
29.
30.
Low myocardial glucose uptake in Turner syndrome is unaffected by growth hormone: a randomized,placebo‐controlled FDG‐PET study
下载免费PDF全文
![点击此处可从《Clinical endocrinology》网站下载免费的PDF全文](/ch/ext_images/free.gif)