全文获取类型
收费全文 | 9813篇 |
免费 | 548篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 195篇 |
儿科学 | 284篇 |
妇产科学 | 232篇 |
基础医学 | 1803篇 |
口腔科学 | 167篇 |
临床医学 | 809篇 |
内科学 | 1792篇 |
皮肤病学 | 183篇 |
神经病学 | 919篇 |
特种医学 | 795篇 |
外科学 | 1421篇 |
综合类 | 85篇 |
一般理论 | 1篇 |
预防医学 | 404篇 |
眼科学 | 213篇 |
药学 | 586篇 |
中国医学 | 16篇 |
肿瘤学 | 491篇 |
出版年
2021年 | 106篇 |
2020年 | 74篇 |
2019年 | 79篇 |
2018年 | 140篇 |
2017年 | 138篇 |
2016年 | 147篇 |
2015年 | 166篇 |
2014年 | 231篇 |
2013年 | 356篇 |
2012年 | 386篇 |
2011年 | 395篇 |
2010年 | 308篇 |
2009年 | 265篇 |
2008年 | 380篇 |
2007年 | 387篇 |
2006年 | 406篇 |
2005年 | 406篇 |
2004年 | 362篇 |
2003年 | 353篇 |
2002年 | 361篇 |
2001年 | 180篇 |
2000年 | 180篇 |
1999年 | 153篇 |
1998年 | 176篇 |
1997年 | 132篇 |
1996年 | 128篇 |
1995年 | 124篇 |
1994年 | 95篇 |
1993年 | 92篇 |
1992年 | 121篇 |
1991年 | 128篇 |
1990年 | 110篇 |
1989年 | 87篇 |
1988年 | 81篇 |
1987年 | 85篇 |
1986年 | 80篇 |
1985年 | 67篇 |
1984年 | 64篇 |
1983年 | 66篇 |
1982年 | 58篇 |
1981年 | 62篇 |
1976年 | 63篇 |
1973年 | 67篇 |
1933年 | 69篇 |
1932年 | 62篇 |
1931年 | 58篇 |
1930年 | 76篇 |
1928年 | 60篇 |
1925年 | 65篇 |
1924年 | 60篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Matthias Guckenberger MD Juergen Meyer Juergen Wilbert Kurt Baier Otto Sauer Michael Flentje 《Strahlentherapie und Onkologie》2007,183(6):307-313
PURPOSE: To evaluate the precision of image-guided radiotherapy (IGRT) using cone-beam computed tomography (CB-CT) for volume imaging and a robotic couch for correcting setup errors in six degrees of freedom. PATIENTS AND METHODS: 47 consecutive patients with 372 fractions were classified according to whether a patient fixation device was used (pat(fix): n = 28) or not (pat(non-fix): n = 19). Prior to treatment a CB-CT was acquired and translational and rotational setup errors were corrected online without an action level using a robotic couch (HexaPOD). A second CB-CT was acquired after the correction process and after treatment in 134 and 238 fractions, respectively. RESULTS: In 17 fractions (4.6%) rotational errors > 3 degrees exceeded the motion range of the HexaPOD. Errors (3D vector) after the correction process were significantly smaller for pat(fix) compared to pat(non-fix) (p < 0.001): 0.9 mm +/- 0.5 mm and 1.6 mm +/- 0.8 mm, respectively. For pat(non-fix) the correction of rotational errors resulted in displacements of the patients on the angled couch of 0.6 mm/1 degree. Intrafractional motion further decreased precision in pat(non-fix) but not in pat(fix). CONCLUSION: Very high precision in cranial and extracranial treatment of immobilized patients was demonstrated. Without application of adequate immobilization the correction of rotational errors and intrafractional patient motion significantly decreased the accuracy of the online correction protocol. 相似文献
22.
Boerhaave’s syndrome: Primary repair vs. esophageal resection—Case reports and meta-analysis of the literature 总被引:3,自引:0,他引:3
Otto Kollmar M.D. Werner Lindemann M.D. Sven Richter M.D. Ingo Steffen M.D. Georg Pistorius M.D. Martin K. Schilling M.D. 《Journal of gastrointestinal surgery》2003,7(6):726-734
Boerhaave’s syndrome is a life-threatening disease with a high mortality. With regard to the heterogeneity of treatment strategies,
no comparative studies exist and recommendations remain controversial. Seventeen cases of Boerhaave’s syndrome operated on
between 1989 and 2000 at our hospital were reviewed retrospectively to compare the time period between perforation and diagnosis,
and the morbidity and mortality among the different treatment options. In addition, we conducted a meta-analysis of the literature
including all series containing five or more patients and compared the findings with our own data. Our patients with a perforation
history of less than 12 hours showed significantly fewer signs of sepsis compared to patients with a history of more than
12 hours. In a comparison of patients with primary repair vs. patients treated with esophageal resection or an exclusion operation,
no differences were found. In the literature, patients with a long period of perforation (more than 24 hours) were treated
more often with an esophageal resection than patients with primary repair. In cases of Boerhaave’s syndrome, primary suturing
of the esophageal perforation should be reserved only for those patients presenting within 12 hours after perforation. In
all other cases, depending on the extent of the tissue damage, a two-stage esophageal resection with cervical esophagostomy
and gastrostomy is recommended as the safest treatment. 相似文献
23.
24.
Trauma und Berufskrankheit - Zusammenfassung Diese Arbeit beschäftigt sich mit der Häufigkeit, dem Entstehungsmechanismus und der Behandlung von Bizepssehnenrupturen. Veränderte... 相似文献
25.
Several areas related to the use of telescopes in low vision are reviewed. These include: contrast sensitivity function; eccentric viewing through a telescope; field of view; telescope used in reverse; and IOL-spectacle lens telescopic systems. Experimental data are included to support selected clinical observations routinely made by low vision clinicians. 相似文献
26.
Otto Robertsson Kaj Knutson Stefan Lewold Stuart Goodman Lars Lidgren 《Acta orthopaedica》1997,68(6):545-553
The Swedish Knee Arthroplasty Register has data on 4, 381 primary operations performed 1985-1995 for rheumatoid arthritis. Of these, 192 were performed with unicompartmental prostheses and 4143 with tricompartmental. 77% were women and the mean age was 66 years. There were 126 first, 20 second, and 1 third revision in tricompartmental arthroplasties, mainly for loosening, infection and patellar problems. There were 38 first, 3 second, and 1 third revision in unicompartmental arthroplasties, mainly for progression of RA and loosening .
Cumulative revision rates (Kaplan-Meier) were calculated. Tricompartmental knees had a 10-year cumulative revision rate of 5% and uni-knees 25%. Patients treated before 1990, men and patients younger than 55 had higher revision rates than patients treated after 1990, women and older patients, respectively. Cemented tibial components resulted in lower revision rates than uncemented ones. There was no significant difference in revision rates between patellar replaced and unreplaced knees or between the 9 commonest implant types. 相似文献
Cumulative revision rates (Kaplan-Meier) were calculated. Tricompartmental knees had a 10-year cumulative revision rate of 5% and uni-knees 25%. Patients treated before 1990, men and patients younger than 55 had higher revision rates than patients treated after 1990, women and older patients, respectively. Cemented tibial components resulted in lower revision rates than uncemented ones. There was no significant difference in revision rates between patellar replaced and unreplaced knees or between the 9 commonest implant types. 相似文献
27.
28.
Dr. Heinrich Dickel Otto Blome Karl-Heinz Hagemann Hans Joachim Schwanitz Oliver Kuss Swen Malte John 《Trauma und Berufskrankheit》2003,5(1):109-118
The dermatologist's procedure was introduced in 1972 by employers' liability insurance funds in the industrial, agricultural and public sectors of Germany's statutory occupational accident insurance as a "procedure for early detection of occupational skin diseases". So far, it is still the most relevant tool for secondary prevention in occupational dermatology in Germany. According to the intention of this procedure, insured persons with a skin disease in which an occupational aetiology is suspected must be offered preventive measures and, if necessary, given appropriate treatment to avoid their losing their jobs. On the initiative of the Central Federation of Industrial Professional Associations (HVBG), a study group was set up in 1999 from among its membership in cooperation with the Working Committee of Occupational and Environmental Dermatology (ABD) and the Professional Organisation of German Dermatologists (BVDD) to improve on the efficiency of the "classic" dermatologist's procedure. The proposed "optimised" dermatologist's procedure is based on the assumption that early detection followed by competent and intensified skin protection and skin care will be successful in retarding or stopping the progression of occupational dermatoses, while later treatment is likely to be less effective. In October 2002, a pilot study started in Northwest Germany to establish by scientific evaluation whether the implementation of secondary protective measures is definitively better when the provisional "optimised" dermatologist's procedure is followed. The study results should allow detailed suggestions for an improved dermatologist's procedure before it is introduced nationwide. 相似文献
29.
Rechtsanwalt Professor Dr. iur. Karl Otto Bergmann Rechtsanwältin Dr. iur. Carolin Wever 《MedR Medizinrecht》2007,25(8):475-476
Ohne Zusammenfassung 相似文献
30.
Rechtsanwalt Professor Dr. iur. Karl Otto Bergmann Rechtsanwältin Dr. iur. Carolin Wever 《MedR Medizinrecht》2007,25(11):649-650
Ohne Zusammenfassung 相似文献