收费全文 | 8884篇 |
免费 | 336篇 |
国内免费 | 168篇 |
耳鼻咽喉 | 240篇 |
儿科学 | 176篇 |
妇产科学 | 41篇 |
基础医学 | 607篇 |
口腔科学 | 208篇 |
临床医学 | 735篇 |
内科学 | 247篇 |
皮肤病学 | 8篇 |
神经病学 | 1222篇 |
特种医学 | 524篇 |
外科学 | 2759篇 |
综合类 | 1309篇 |
现状与发展 | 1篇 |
预防医学 | 167篇 |
眼科学 | 497篇 |
药学 | 442篇 |
6篇 | |
中国医学 | 119篇 |
肿瘤学 | 80篇 |
2024年 | 25篇 |
2023年 | 156篇 |
2022年 | 234篇 |
2021年 | 371篇 |
2020年 | 327篇 |
2019年 | 257篇 |
2018年 | 285篇 |
2017年 | 284篇 |
2016年 | 334篇 |
2015年 | 289篇 |
2014年 | 683篇 |
2013年 | 600篇 |
2012年 | 601篇 |
2011年 | 590篇 |
2010年 | 401篇 |
2009年 | 497篇 |
2008年 | 449篇 |
2007年 | 431篇 |
2006年 | 356篇 |
2005年 | 318篇 |
2004年 | 276篇 |
2003年 | 236篇 |
2002年 | 171篇 |
2001年 | 139篇 |
2000年 | 145篇 |
1999年 | 117篇 |
1998年 | 119篇 |
1997年 | 79篇 |
1996年 | 78篇 |
1995年 | 72篇 |
1994年 | 58篇 |
1993年 | 52篇 |
1992年 | 37篇 |
1991年 | 39篇 |
1990年 | 23篇 |
1989年 | 29篇 |
1988年 | 32篇 |
1987年 | 18篇 |
1986年 | 24篇 |
1985年 | 37篇 |
1984年 | 17篇 |
1983年 | 11篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 8篇 |
1979年 | 10篇 |
1978年 | 16篇 |
1977年 | 9篇 |
1976年 | 7篇 |
1973年 | 3篇 |
Methods: Single-centre retrospective Computed Tomogram (CT)-based study; 20 subjects of each ethnicity were used from existing databases, matched for gender, average age and laterality. Subjects below 16 years of age were excluded. DICOM image viewing software CARESTREAM Vue PACS (Carestream Health Inc., USA) and OsiriX version 7.5 (Pixmeo., Switzerland) were used to measure deep lateral wall length, thickness and volume, as well as orbital depth and statistical analyses performed using Statistical Package for Social Sciences version 21 (IBM, USA).
Results: In each group, there were 12 males (60%) and average age was not significantly different (p = 0.682–0.987). Using Chinese subjects as a reference, in Chinese, Malay, Indian and Caucasian subjects, mean trigone thickness was 13.68, 14.02, 11.60 (p < 0.001) and 13.80 mm, curved total wall length 45.23, 42.29 (p = 0.048), 41.91 (p = 0.020) and 45.00 mm, curved trigone length 23.03, 22.61, 17.19 (p = 0.011) and 18.76 mm (p = 0.030) and trigone volume 3120.97, 3221.01, 1613.66 (p < 0.001), 2498.46 mm3 (p = 0.059) respectively. Similarly, perpendicular orbital depth was 27.54, 24.97, 22.12 (p = 0.001) and 25.93 mm and diagonal orbital depth was 34.19, 33.27, 29.48 (p = 0.01) and 34.63 mm respectively.
Conclusions: Indian and, to a lesser extent, Caucasian subjects have smaller trigones compared to their Chinese and Malay counterparts. Indian subjects also have shallower orbits and due care should be taken during decompression surgery. 相似文献
Methods: A retrospective analysis was performed to identify patients with isolated PCL injuries that underwent reconstruction between 2001 and 2014. Patients with multi-ligamentous injury or another concomitant knee pathology were excluded. Medical records were reviewed for demographic, clinical and operative data. Patients were contacted for administration of a telephone-based questionnaire which included the International Knee Documentation Committee (IKDC) Subjective Knee Evaluation form, Lysholm-Tegner scales, Marx activity scale (MAS), return to sport status, and patient satisfaction instruments.
Results: A total of 15 isolated PCL reconstructions in 14 patients with a mean age of 27.5 years (range 17–43) met the study inclusion criteria; mean follow up was 6.3 years (range 1.4–15.2). Pre-operatively, the primary complaint was knee instability in all patients; on physical examination, lack of a firm end point during posterior drawer testing was found in 93% (14/15) of the knees. In total, 12 of 15 knees underwent transtibial, single-bundle PCLR and three of 15 underwent tibial inlay, double bundle PCLR. Graft types included: quadriceps autograft (7/15), Achilles allograft (6/15), and hamstring autograft (2/15). There were no graft failures in our patient cohort. At most recent follow up the mean scores respectively on the IKDC form, Lysholm-Tegner scales and MAS were (standard deviation): 77.3 (16.5), 83.1 (17.9), 6.13 (2.6), and 7.1 (6.0). All fourteen patients were athletes prior to their injury and 79% (11/14) returned to sport and overall patient satisfaction was 9.2/10.
Conclusions: Isolated PCLR provides good outcomes at mean medium-term follow up with restoration of function, high rate of return to sport and overall patient satisfaction. 相似文献