全文获取类型
收费全文 | 4627篇 |
免费 | 353篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 91篇 |
儿科学 | 215篇 |
妇产科学 | 37篇 |
基础医学 | 472篇 |
口腔科学 | 39篇 |
临床医学 | 560篇 |
内科学 | 862篇 |
皮肤病学 | 33篇 |
神经病学 | 630篇 |
特种医学 | 330篇 |
外科学 | 581篇 |
综合类 | 120篇 |
一般理论 | 2篇 |
预防医学 | 493篇 |
眼科学 | 32篇 |
药学 | 292篇 |
2篇 | |
中国医学 | 2篇 |
肿瘤学 | 202篇 |
出版年
2022年 | 25篇 |
2021年 | 67篇 |
2020年 | 59篇 |
2019年 | 87篇 |
2018年 | 109篇 |
2017年 | 77篇 |
2016年 | 69篇 |
2015年 | 97篇 |
2014年 | 106篇 |
2013年 | 173篇 |
2012年 | 215篇 |
2011年 | 241篇 |
2010年 | 151篇 |
2009年 | 134篇 |
2008年 | 203篇 |
2007年 | 208篇 |
2006年 | 220篇 |
2005年 | 181篇 |
2004年 | 171篇 |
2003年 | 198篇 |
2002年 | 170篇 |
2001年 | 153篇 |
2000年 | 137篇 |
1999年 | 132篇 |
1998年 | 87篇 |
1997年 | 99篇 |
1996年 | 75篇 |
1995年 | 72篇 |
1994年 | 64篇 |
1993年 | 59篇 |
1992年 | 100篇 |
1991年 | 79篇 |
1990年 | 83篇 |
1989年 | 78篇 |
1988年 | 70篇 |
1987年 | 76篇 |
1986年 | 78篇 |
1985年 | 68篇 |
1984年 | 52篇 |
1983年 | 72篇 |
1982年 | 32篇 |
1981年 | 35篇 |
1980年 | 26篇 |
1979年 | 29篇 |
1978年 | 25篇 |
1977年 | 35篇 |
1975年 | 26篇 |
1974年 | 22篇 |
1973年 | 21篇 |
1971年 | 20篇 |
排序方式: 共有4995条查询结果,搜索用时 15 毫秒
1.
2.
Mary C. Gawlicki MBA Margaret C. Reilly MPH Ana Popielnicki BA Kate Reilly MA 《Value in health》2006,9(3):199-204
INTRODUCTION: There are no measures of health-related absenteeism and presenteeism validated for use in the large and increasing US Spanish-speaking population. Before using a Spanish translation of an available English-language questionnaire, the linguistic validity of the Spanish version must be established to ensure its conceptual equivalence to the original and its cultural appropriateness. OBJECTIVE: The objective of this study was to evaluate the linguistic validity of the US Spanish version of the Work Productivity and Activity Impairment questionnaire, General Health Version (WPAI:GH). METHODS: A US Spanish translation of the US English WPAI:GH was created through a reiterative process of creating harmonized forward and back translations by independent translators. Spanish-speaking and English-speaking subjects residing in the US self-administered the WPAI:GH in their primary language and were subsequently debriefed by a bilingual (Spanish-English) interviewer. RESULTS: US Spanish subjects (N = 31) and English subjects (N = 35), stratified equally by educational level, with and without a high school degree participated in the study. The WPAI-GH item comprehension rate was 98.6% for Spanish and 99.6% for English. Response revision rates during debriefing were 1.6% for Spanish and 0.5% for English. Responses to hypothetical scenarios indicated that both language versions adequately differentiate sick time taken for health and non-health reasons and between absenteeism and presenteeism. CONCLUSION: Linguistic validity of the US Spanish translation of the WPAI:GH was established among a diverse US Spanish-speaking population, including those with minimal education. 相似文献
3.
4.
Intracranial circulation: pulse-sequence considerations in three- dimensional (volume) MR angiography 总被引:2,自引:0,他引:2
The technique and feasibility of magnetic resonance (MR) angiography of intracranial vessels were studied in 35 healthy volunteers. Variations in image orientation, repetition time (TR), and flip angle were evaluated to determine their effects on flow-related enhancement. Gradient modifications--including echo time (TE), motion compensation, bandwidth, and field of view--were also studied in an effort to reduce motion-induced phase shifts. Results indicated that a FISP (fast imaging with steady precession) sequence with a TR of 50 msec, TE of 15 msec, velocity compensation in the read and section-select directions, acceleration compensation in the read direction, anisotropic volume, and a 1.25-mm partition thickness produced three-dimensional angiographic MR images that were accurate and reproducible in the depiction of the major intracranial vessels. Difficulties with field of view, persistent signal void secondary to higher-order motion, and spatial resolution remain major problems requiring additional study. 相似文献
5.
Clay E. Reilly 《Journal of neurology》2002,249(10):1345-1346
6.
7.
M J Hershman R I Swift D T Reilly W A Logan J M Sackier H Gompertz J Horner N W Baker C B Wood 《Journal of the Royal College of Surgeons of Edinburgh》1990,35(1):29-32
This study compared one dose of cefotetan with three doses of piperacillin as prophylaxis against wound infection in 153 patients undergoing elective colorectal surgery. The patients were randomized into two groups: the first received 2 g cefotetan intravenously with induction of anaesthesia (n = 75), and the second received three doses of 2 g piperacillin (n = 78). Wound infection was defined as the presence of an abscess or discharging pus from the wound. In the cefotetan group there were 14 (19%) wound infections and 13 (17%) in the piperacillin group. There were three septic deaths, one in the cefotetan group and two in the piperacillin group. Both groups were comparable with regard to age, sex, nature of pathology and pre- and perioperative risk factors. No significant haematological or biochemical abnormalities were detected. The only adverse reaction was one patient who had an allergic reaction (rash) to piperacillin. These data suggest that single-dose cefotetan is as effective as triple-dose piperacillin in prophylaxis against infection in elective colorectal surgery. 相似文献
8.
9.
Paediatric dacryocystorhinostomy 总被引:1,自引:0,他引:1
KN Hakin FRCS FRCOphth TJ Sullivan FRACO FRACS A Sharma FCOphth † RAN Welham FRCS FCOphth † 《Clinical & experimental ophthalmology》1994,22(4):231-235
Of 258 cases of dacryocystorhinostomy performed on children in the period September 1981 to September 1991, 130 were for simple, unresolved congenital nasolacrimal duct obstruction. Other indications for surgery included punctal agenesis, lacrimal fistula, post-traumatic and post-inflammatory canalicular obstruction. Of 177 children without canalicular pathology, 171 (96%) were relieved of symptoms with one operation, without canalicular intubation. Of 81 cases with canalicular disease, 55 of 70 (79%) who underwent DCR plus canalicular intubation, and 10 of 11 who underwent DCR plus Lester-Jones tube, were substantially improved with one operation. No child required peroperative or postoperative blood transfusion. Dacryocystorhinostomy in childhood, in experienced surgical hands, is a safe procedure, achieving relief of symptoms in most cases, particularly in the absence of canalicular disease. 相似文献
10.
J. O’Byrne S. Eustace M. M. Stephens M. N. M. R. Farahat G. Yanni R. Posten G. S. Panayi S. Sant R. Costello M. Barry J. Hassan C. Feighery B. Bresnihan A. Whelan F. Coakley A. M. de Paor R. B. Reilly E. B. Casey V. J. Tormey G. Kearns K. Gaffney P. J. Freyne M. Callaghan O. FitzGerald D. Veale E. O’Nuallain D. Reen D. Veale M. Farrell O. FitzGerald S. Rogers L. Barnes R. J. Coughlan C. McCarthy M. McDermott D. Hourihane C. O'Morain S. O'Reilly P. Hartley E. Casey L. Clancy F. Mulcahy N. Hall A. Murphy C. Breen D. Kelleher M. Abuzakouk C. O'Farrelly 《Irish journal of medical science》1992,161(6):438-442