全文获取类型
收费全文 | 7276篇 |
免费 | 520篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 32篇 |
儿科学 | 215篇 |
妇产科学 | 148篇 |
基础医学 | 1204篇 |
口腔科学 | 73篇 |
临床医学 | 838篇 |
内科学 | 1412篇 |
皮肤病学 | 196篇 |
神经病学 | 689篇 |
特种医学 | 171篇 |
外科学 | 563篇 |
综合类 | 96篇 |
一般理论 | 5篇 |
预防医学 | 975篇 |
眼科学 | 198篇 |
药学 | 473篇 |
中国医学 | 20篇 |
肿瘤学 | 508篇 |
出版年
2023年 | 68篇 |
2022年 | 104篇 |
2021年 | 207篇 |
2020年 | 122篇 |
2019年 | 180篇 |
2018年 | 207篇 |
2017年 | 164篇 |
2016年 | 203篇 |
2015年 | 196篇 |
2014年 | 266篇 |
2013年 | 381篇 |
2012年 | 477篇 |
2011年 | 600篇 |
2010年 | 317篇 |
2009年 | 302篇 |
2008年 | 528篇 |
2007年 | 454篇 |
2006年 | 463篇 |
2005年 | 496篇 |
2004年 | 389篇 |
2003年 | 379篇 |
2002年 | 340篇 |
2001年 | 70篇 |
2000年 | 57篇 |
1999年 | 48篇 |
1998年 | 66篇 |
1997年 | 51篇 |
1996年 | 46篇 |
1995年 | 44篇 |
1994年 | 43篇 |
1993年 | 48篇 |
1992年 | 36篇 |
1991年 | 28篇 |
1990年 | 29篇 |
1989年 | 18篇 |
1988年 | 26篇 |
1987年 | 12篇 |
1986年 | 14篇 |
1985年 | 20篇 |
1984年 | 27篇 |
1983年 | 19篇 |
1982年 | 24篇 |
1981年 | 14篇 |
1980年 | 15篇 |
1979年 | 12篇 |
1978年 | 12篇 |
1976年 | 15篇 |
1975年 | 23篇 |
1974年 | 14篇 |
1973年 | 17篇 |
排序方式: 共有7816条查询结果,搜索用时 15 毫秒
991.
Sylvia Villeneuve Fadi Massoud Christian Bocti Serge Gauthier Sylvie Belleville 《Neuropsychologia》2011,49(11):3027-3035
This study measured episodic memory deficits in individuals with mild cognitive impairment (MCI) as a function of their vascular burden. Vascular burden was determined clinically by computing the number of vascular risk factors and diseases and neuroradiologically by assessing the presence and severity of white matter lesions (WML). Strategic memory processes were measured with free recall and temporal contextual memory tasks requiring self-initiated retrieval. Nonstrategic memory retrieval processes were appraised with a five-choice recognition procedure. Results showed that MCI participants with high vascular burden displayed impairment of strategic memory processes, whereas MCI participants with no vascular burden showed impairment of both strategic and nonstrategic memory processes. A similar pattern was found whether vascular burden was measured using a clinical index of vascular risk profile or whether it was measured neuroradiologically by assessing the extent and severity of subcortical WML. However, the effect of WML on memory differed as function of level of education, used here as a proxy for cognitive reserve. Among participants with MCI, those who had higher education and no WML were the least memory impaired. The study also examined memory as a function of whether patients later progressed to dementia after a three-year follow-up. When examining progressors’ performance, strategic and nonstrategic processes were both impaired in progressors with no concomitant vascular conditions, whereas progressors with a high vascular burden showed less impairment of nonstrategic than strategic processes. Overall, results indicate that the presence of vascular burden in MCI is associated with selective impairment of strategic memory processes. 相似文献
992.
With respect to VTE prevention, several steps can be taken by orthopedic surgeons to ensure the best standard of patient care. All patients should be assessed for VTE risk and appropriate prophylaxis should be provided. Venous thromboembolism prophylaxis guidelines, hospital protocols, and risk assessment models can guide orthopedic surgeons in making individualized decisions. In cases where guidelines offer no direct recommendations, or disagree, standardized care may need to be tempered by clinical judgment and individual patient considerations. Improved health care and better outcomes can be achieved for orthopedic surgery patients by considering VTE prophylaxis from the viewpoint of the clinical guidelines and patient-specific factors. 相似文献
993.
994.
Introduction and hypothesis
Mixed urinary incontinence (MUI) is a coexistence of stress (SUI) and urgency urinary incontinence (UUI). There is conflicting evidence on the effectiveness of midurethral slings (MUS) in this condition. The objective of this study is to evaluate the effectiveness of MUS in women with MUI by systematic review of the literature. 相似文献995.
Kramer S Lau A Krämer M Wendler OG Müller-Lobeck L Scheding C Klarhöfer M Schaffartzik W Neumann T Krampe H Spies C 《麻醉学,监护医学,急救医学,疼痛治疗》2011,46(10):694-698
At present, providers at an Anesthesia Preoperative Evaluation Clinic (APEC) may have difficulties in gaining access to relevant clinical information, including external medical records, surgical dictations etc. This common occurence makes obtaining an informed consent by the patient after a complete pre-anesthetic assessment difficult. This form of patient information is subject to wide interindividual variations and, thus, represents a challenge for quality assurance. Insufficient or not completed pre-anesthetic assessments can lead to an untimely termination of an elective procedure.A web-based pre-anesthetic evaluation record moves the time point of the first contact to well before the day of admission. The current pre-anesthesia evaluation record is replaced by a structured interview in the form of a complex of questions in a specific hierarchy taking guidelines, standard operating procedures (SOP) and evidence-based medicine (EBM) into consideration. The answers to the complex of questions are then classified according to agreed criteria and possible scoring systems of relevant classifications. The endpoints result in procedural recommendations not only for the informing anesthesiologist but also for the patient. The standardized risk criteria can be used as core process indicators to check the process quality of the anesthesiological risk evaluation. Short-notice cancellations of elective operations due to incomplete premedication procedures will then be avoided with the help of such structured and evidence-based patient interviews with detailed assessment of the anesthesiological risk profile.The web-based anesthesia evaluation record (WAR) corresponds with the recommendations of the DGAI to carry out the staged information in analogy to the staged information of Weissauer. The basic practice is not changed by WACH. By means of WACH, the time point of the first contact with anesthesia is moved forward and occurs within a different framework. WACH has potential advantages for both patient and anesthesiologist, not least due to a higher patient safety. 相似文献
996.
997.
998.
Susie Oliveira Sylvia Thomas Clara Lorena Glria dos Santos Mirta Barbara Torres Berdeguez Lidia Vasconcellos de Sa Sergio Augusto Lopes de Souza 《Haemophilia》2019,25(3):509-513
One of the key features of good practice in medicine is the doctor‐patient communication. Radiation protection standards for radiosynovectomy (RS) is limited. Yttrium‐90 is a beta‐emitting radioisotope used in RS to treat joint pain from haemophilic arthritis. ICRP 94 states that if a patient is treated with up to 200 MBq, there is no need for further precautions when it comes to public exposure, however, activities can go up to 370 MBq in RS for the knee. This study analysed 119 family members’ safety (16.7% pregnant women). The ambient dose equivalent rate was measured within four distances. A survey was carried analysing risk groups and time spent next to patients. Results showed that family members should be advised to remain at 1.0 m from the patient to decrease accumulated dose by 97.6%. The dose per activity factors estimated in this study is also a useful tool during the risk assessment and doctor/patient communication. Pamphlets were distributed with radiation protection recommendations. Ambient dose equivalent was low enough to show that RS is a safe procedure for family members, which is essential to promote adherence to RS in countries where it is needed but not performed due to lack of information on radiation safety. 相似文献
999.
Adam Trickey Hannah Fraser Aaron G. Lim Josephine G. Walker Amy Peacock Samantha Colledge Janni Leung Jason Grebely Sarah Larney Natasha K. Martin Louisa Degenhardt Matthew Hickman Margaret T. May Peter Vickerman 《Journal of viral hepatitis》2019,26(12):1388-1403
The World Health Organization (WHO) recently produced guidelines advising a treat‐all policy for HCV to encourage widespread treatment scale‐up for achieving HCV elimination. We modelled the prevention impact achieved (HCV infections averted [IA]) from initiating this policy compared with treating different subgroups at country, regional and global levels. We assessed what country‐level factors affect impact. A dynamic, deterministic HCV transmission model was calibrated to data from global systematic reviews and UN data sets to simulate country‐level HCV epidemics with ongoing levels of treatment. For each country, the model projected the prevention impact (in HCV IA per treatment undertaken) of initiating four treatment strategies; either selected randomly (treat‐all) or targeted among people who inject drugs (PWID), people aged ≥35, or those with cirrhosis. The IA was assessed over 20 years. Linear regression was used to identify associations between IA per treatment and demographic factors. Eighty‐eight countries (85% of the global population) were modelled. Globally, the model estimated 0.35 (95% credibility interval [95%CrI]: 0.16‐0.61) IA over 20 years for every randomly allocated treatment, 0.30 (95%CrI: 0.12‐0.53) from treating those aged ≥35 and 0.28 (95%CrI: 0.12‐0.49) for those with cirrhosis. Globally, treating PWID achieved 1.27 (95%CrI: 0.68‐2.04) IA per treatment. The IA per randomly allocated treatment was positively associated with a country's population growth rate and negatively associated with higher HCV prevalence among PWID. In conclusion, appreciable prevention benefits could be achieved from WHO’s treat‐all strategy, although greater benefits per treatment can be achieved through targeting PWID. Higher impact will be achieved in countries with high population growth. 相似文献
1000.