全文获取类型
收费全文 | 1326935篇 |
免费 | 95857篇 |
国内免费 | 2890篇 |
专业分类
耳鼻咽喉 | 19703篇 |
儿科学 | 40138篇 |
妇产科学 | 38662篇 |
基础医学 | 185735篇 |
口腔科学 | 39751篇 |
临床医学 | 111936篇 |
内科学 | 260176篇 |
皮肤病学 | 30162篇 |
神经病学 | 105715篇 |
特种医学 | 53630篇 |
外国民族医学 | 435篇 |
外科学 | 207524篇 |
综合类 | 30978篇 |
现状与发展 | 6篇 |
一般理论 | 436篇 |
预防医学 | 91411篇 |
眼科学 | 31300篇 |
药学 | 99815篇 |
2篇 | |
中国医学 | 2948篇 |
肿瘤学 | 75219篇 |
出版年
2018年 | 11750篇 |
2015年 | 11880篇 |
2014年 | 16702篇 |
2013年 | 25253篇 |
2012年 | 33025篇 |
2011年 | 34895篇 |
2010年 | 20746篇 |
2009年 | 20244篇 |
2008年 | 33589篇 |
2007年 | 36693篇 |
2006年 | 37269篇 |
2005年 | 36022篇 |
2004年 | 35099篇 |
2003年 | 34024篇 |
2002年 | 33512篇 |
2001年 | 63528篇 |
2000年 | 65166篇 |
1999年 | 55028篇 |
1998年 | 13850篇 |
1997年 | 12611篇 |
1996年 | 12106篇 |
1995年 | 12137篇 |
1994年 | 11398篇 |
1992年 | 42715篇 |
1991年 | 41279篇 |
1990年 | 40533篇 |
1989年 | 39527篇 |
1988年 | 36925篇 |
1987年 | 36394篇 |
1986年 | 34873篇 |
1985年 | 33096篇 |
1984年 | 24783篇 |
1983年 | 20982篇 |
1982年 | 12606篇 |
1981年 | 11502篇 |
1980年 | 10706篇 |
1979年 | 23861篇 |
1978年 | 17016篇 |
1977年 | 14759篇 |
1976年 | 13331篇 |
1975年 | 15217篇 |
1974年 | 18039篇 |
1973年 | 17534篇 |
1972年 | 16788篇 |
1971年 | 15694篇 |
1970年 | 14875篇 |
1969年 | 14320篇 |
1968年 | 13438篇 |
1967年 | 11992篇 |
1966年 | 11241篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Saisanjana Kalagara Adam E.M. Eltorai J. Mason DePasse Alan H. Daniels 《The spine journal》2019,19(1):182-185
BACKGROUND
Online physician rating websites are increasingly used by patients to evaluate their doctors. The purpose of this investigation was to evaluate factors associated with better spine surgeon ratings.METHODS
Orthopedic spine surgeons were randomly selected from the North American Spine Society directory utilizing a random number generator. Surgeon profiles on three physician rating websites, namely, www.HealthGrades.com, www.Vitals.com, and www.RateMDs.com, were analyzed to gather qualitative and quantitative data on patients’ perceptions of the surgeons. Independent variables from the websites were analyzed in relation to overall physician or patient satisfaction rating. Comments were coded by subject into following three categories: professional competence, bedside manner, and practice characteristics.RESULTS
A total of 250 surgeons were evaluated, and 92% (n=230) of these doctors had at least one rating among the three websites. The surgeons with a higher average rating had significantly better trust (p<.01), scheduling (p<.01), staff (p<.01), helpfulness (p<.01), and punctuality (p<.01) scores but significantly less experience (p<.05). A linear regression model for the average rating of each surgeon (R2 value=0.754) yielded only following three significant variables: trustworthiness (p<.01), experience match (p<.05), and the average number of negative comments on surgeon's professional competence (p<.05). Trustworthiness (β=0.749) was the strongest predictor variable of physician rating, followed by the number of negative professional competence comments (β=?0.132) and experience match (β=?0.112).CONCLUSIONS
This investigation assessed spine surgeon online patient ratings and categorized factors that patients associate with quality care. Trustworthiness was the most significant predictor of positive ratings, whereas ease of scheduling, quality of staff, helpfulness, and punctuality were also associated with higher patient ratings. Understanding what patients value may help optimize care of spine surgery patients. 相似文献102.
103.
104.
Michelle Y L Tang Patrick H Y Chung Hau Y Chan Paul K H Tam Kenneth KY Wong 《Journal of pediatric surgery》2019,54(2):255-257
Objective
Helicobacter pylori infection is common among Asians. However, evidence in the recent years has demonstrated a decrease in the prevalence of H. pylori infection among children and adults worldwide. Our aim was to update its prevalence in symptomatic children in our locality in the recent 12?years and compared to the results of our previous review published in 2005.Methods
A retrospective review was carried out between 2005 and 2017. All children who presented with dyspepsia or gastrointestinal bleeding and underwent oesophagogastroduodenoscopy with antral biopsy taken were included. Patient demographics, endoscopic, or histological diagnosis and the H. pylori status were recorded.Main Results
A total of 602 patients were included. There was a statistically significant decreasing trend of H. pylori infection rate between 2005 and 2017 (p?=?0.003). The overall infection rate from this study was 12.8%, compared to 25.6% from our previous review. Overall failure of eradication with first-line antibiotic therapy has increased to 29.3% from 10% in our previous review.Conclusion
There was a decrease in the prevalence of H. pylori infection among symptomatic children for the recent 12?years, comparing to our previous data from 2005. We hypothesize that the reduction in prevalence of H. pylori infection among adults and the decrease in the practice of sharing chopsticks during meals have led to a decrease in transmission of the bacteria among family members in Hong Kong. However, the failure of eradication with first line treatment was higher, possibly due to the increase in antibiotics usage and resistance.Level of Evidence
III 相似文献105.
Paul J. Devlin Brian W. McCrindle James K. Kirklin Eugene H. Blackstone William M. DeCampli Christopher A. Caldarone Ali Dodge-Khatami Pirooz Eghtesady James M. Meza Peter J. Gruber Kristine J. Guleserian Bahaaladin Alsoufi Linda M. Lambert James E. OBrien Erle H. Austin Jeffrey P. Jacobs Tara Karamlou 《The Journal of thoracic and cardiovascular surgery》2019,157(2):684-695.e8
Objective
Arch obstruction after the Norwood procedure is common and contributes to mortality. We determined the prevalence, associated factors, and practice variability of arch reintervention and assessed whether arch reintervention is associated with mortality.Methods
From 2005 to 2017, 593 neonates in the Congenital Heart Surgeons' Society Critical Left Heart Obstruction cohort underwent a Norwood procedure. Median follow-up was 3.7 years. Multivariable parametric models, including a modulated renewal analysis, were performed.Results
Of the 593 neonates, 146 (25%) underwent 218 reinterventions for arch obstruction after the Norwood procedure: catheter-based (n = 168) or surgical (n = 50) at a median age of 4.3 months (quartile 1-quartile 3, 2.6-5.7). Interdigitation of the distal aortic anastomosis was protective against arch reintervention. Development of ≥ moderate tricuspid valve regurgitation and right ventricular dysfunction at any point was associated with arch reintervention. Nonsignificant variables for arch reintervention included shunt type and preoperative aortic measurements. Surgical arch reintervention was protective against arch reintervention, but transcatheter reintervention was associated with increased reintervention. Arch reintervention was not associated with increased mortality. There was wide institutional variation in incidence of arch reintervention (range, 0-40 reinterventions per 100 years patient follow-up) and in preintervention gradient (range, 0-64 mm Hg).Conclusions
Interdigitation of the distal aortic anastomosis during the Norwood procedure decreased the risk of arch reintervention. Surgical arch reintervention is more definitive than transcatheter. Arch reintervention after the Norwood procedure is not associated with increased mortality. Serial surveillance for arch obstruction, integrated with changes in right ventricular function and tricuspid valve regurgitation, is recommended after the Norwood procedure to improve outcomes. 相似文献106.
107.
108.
Eloise R. Galligan Leila H. Shayegan Christine T. Lauren Kimberly D. Morel 《Pediatric dermatology》2019,36(5):753-754
Shaving and other modes of epilation can cause undue anxiety, pain, or skin irritation in children. Here, we present hair trimming as a safe, painless, and cost‐effective alternative for patients with unwanted hair which may be performed indefinitely or until the child is old enough to direct management. In select cases, removing unwanted hair using this technique may facilitate dermatologic surveillance. 相似文献
109.
Objectives
To identify temporal trends in muscular fitness of English children using allometric scaling for height and weight to adjust for the influence of body size.Design
Repeated cross-sectional study.Methods
We measured; height, weight, standing broad-jump, handgrip, sit-ups and bent-arm hang in 10-year-old boys and girls from Chelmsford, England in: 2014 (n = 306), 2008 (n = 304) and 1998 (n = 310). Physical activity was (PAQ-C) was assessed in 2008 and 2014. Muscular fitness was allometrically scaled for height and weight. We assessed temporal trends using General Linear Models (fixed factors: wave and sex) and reported effect sizes using partial eta squared (ηP2). We compared percentage change per year 1998–2008 with 2008–2014.Results
Ten-year-olds in 2014 were taller and heavier than in 2008 and 1998 but there were no differences in BMI. Compared with 2008, physical activity was lower in boys (ηP2 = 0.012) and girls (ηP2 = 0.27) assessed in 2014. There were significant main effects of wave for handgrip (ηP2 = 0.060), sit-ups (ηP2 = 0.120) and bent-arm hang (ηP2 = 0.204). Pairwise comparisons showed muscular fitness of both sexes was significantly lower in 2014 than in 1998. From 2008 to 2014 percent change per year in handgrip (1.6%) and sit-ups (3.9%) were greater than for the preceding decade (handgrip 0.6%, sit-ups 2.6%).Conclusions
Downward temporal trends in muscular fitness appear independent of secular changes in body size. We found a decrease in self-reported physical activity concurrent with the accelerated declines in fitness from 2008 to 2014. These findings suggest the declines in children are not engaging in physical activities which support development of muscular fitness. 相似文献110.
A.K. Gupta S.G. Versteeg N.H. Shear 《Journal of the European Academy of Dermatology and Venereology》2019,33(2):281-287
Due to the high relapse rates and the rise of predisposing factors, the need for curing onychomycosis is paramount. To effectively address onychomycosis, the definition of cure used in a clinical setting should be agreed upon and applied homogeneously across therapies (e.g. oral, topical and laser treatments). In order to determine what is or what should be used to define cure in a clinical setting, a literature search was conducted to identify methods used to evaluate treatment success. The limitations, strengths, prevalence and utility of each outcome measure were investigated. Seven ways to measure treatment success were identified; mycological cure, patient/investigator assessments, complete cure, quality of life instruments, severity indexes, clinical cure and temporary clearance. Despite its shortcomings, mycological cure is the most objective and consistent outcome measure used across onychomycosis studies. It is suggested that diagnostic goals of onychomycosis should be used to define cure in a clinical setting. Modifications to outcome measures such as incorporating molecular‐based techniques could be a future avenue to explore. 相似文献