全文获取类型
收费全文 | 7786篇 |
免费 | 667篇 |
国内免费 | 39篇 |
专业分类
耳鼻咽喉 | 97篇 |
儿科学 | 208篇 |
妇产科学 | 137篇 |
基础医学 | 1144篇 |
口腔科学 | 245篇 |
临床医学 | 777篇 |
内科学 | 1599篇 |
皮肤病学 | 107篇 |
神经病学 | 734篇 |
特种医学 | 211篇 |
外科学 | 1070篇 |
综合类 | 88篇 |
一般理论 | 2篇 |
预防医学 | 680篇 |
眼科学 | 192篇 |
药学 | 534篇 |
中国医学 | 13篇 |
肿瘤学 | 654篇 |
出版年
2023年 | 87篇 |
2022年 | 137篇 |
2021年 | 271篇 |
2020年 | 162篇 |
2019年 | 207篇 |
2018年 | 262篇 |
2017年 | 162篇 |
2016年 | 201篇 |
2015年 | 195篇 |
2014年 | 292篇 |
2013年 | 370篇 |
2012年 | 564篇 |
2011年 | 532篇 |
2010年 | 286篇 |
2009年 | 265篇 |
2008年 | 439篇 |
2007年 | 441篇 |
2006年 | 362篇 |
2005年 | 374篇 |
2004年 | 318篇 |
2003年 | 264篇 |
2002年 | 256篇 |
2001年 | 168篇 |
2000年 | 163篇 |
1999年 | 157篇 |
1998年 | 83篇 |
1997年 | 52篇 |
1996年 | 48篇 |
1995年 | 41篇 |
1994年 | 40篇 |
1993年 | 41篇 |
1992年 | 87篇 |
1991年 | 90篇 |
1990年 | 80篇 |
1989年 | 65篇 |
1988年 | 73篇 |
1987年 | 68篇 |
1986年 | 79篇 |
1985年 | 73篇 |
1984年 | 51篇 |
1983年 | 38篇 |
1981年 | 32篇 |
1980年 | 25篇 |
1979年 | 67篇 |
1978年 | 41篇 |
1977年 | 36篇 |
1976年 | 37篇 |
1974年 | 36篇 |
1973年 | 39篇 |
1971年 | 31篇 |
排序方式: 共有8492条查询结果,搜索用时 500 毫秒
1.
Oliveira Gonalves Ana Sofia Panteli Dimitra Neeb Lars Kurth Tobias Aigner Annette 《The European journal of health economics》2022,23(1):47-57
The European Journal of Health Economics - The aims of this study were to assess whether there is a conceptual overlap between the questionnaires HIT-6 and EQ-5D and to develop a mapping algorithm... 相似文献
2.
3.
4.
5.
Jorge Guardado Carlos Cotrim Otília Sim?es Sofia Almeida Mário Ialá Luís Lopes Hélder Pereira Manuel Carrageta 《Revista portuguesa de cardiologia》2006,25(4):409-415
INTRODUCTION: Transesophageal echocardiography (TEE) has become increasingly useful in the study of patients with suspected pulmonary thromboembolism. OBJECTIVE: The aim of this study was to prospectively evaluate the usefulness of TEE in the study of the distal part of the left pulmonary artery (LPA) as well as the influence of this procedure on total echocardiographic exam duration. METHODOLOGY: A prospective study in two groups of consecutive patients referred for TEE with a one- year interval between evaluation of Group A: 33 patients, 17 male, mean age 54 +/- 24 years, and Group B: 42 patients, 20 male, mean age 48 +/- 27 years (p = NS). The procedure was considered long when it took more than 3 min to evaluate the distal part of the LPA. RESULTS: In group A we were able to visualize the distal part of the LPA in 24 patients (73%) without significant prolongation of total exam duration in 16 patients (48% of group A). In one of the patients with suspected pulmonary thromboembolism thrombi were only observed in the distal part of the LPA. In group B we were able to visualize the distal part of the LPA in 36 patients (86%) without significant prolongation of total exam duration in 26 patients (61% of group B). CONCLUSIONS: 1. Visualization of the distal part of the LPA was possible in more patients, and with TEE time prolongation in less patients, in group B. These differences can be accounted for by the training of the operator in this technique. 2. The importance of visualization of this part of the LPA in guiding treatment in the subset of patients with pulmonary thromboembolism confirms the usefulness of this specific procedure. 相似文献
6.
R W Hertle A B Leahey S Bloom D B Schaffer S Bartlett 《Ophthalmic plastic and reconstructive surgery》1990,6(4):278-282
Chorioretinal folds have been reported as a result of many intraocular and extraocular inflammatory processes or tumors. Visual loss is usually secondary to a combination of the underlying process and chorioretinal folds involving the macula. We report a patient who developed decreased vision, metamorphopsia, chorioretinal folds, and a lamellar macular hole secondary to global compression by a bone fragment. The chorioretinal folds regressed and his vision stabilized following surgical decompression. Chorioretinal folds and lamellar macular hold formation are previously unrecognized complications of reconstructive craniofacial surgery. 相似文献
7.
Five cases of unilateral vocal cord paralysis/paresis were diagnosed following extracorporeal membrane oxygenation for newborn respiratory failure. All were right sided and transient in nature. None of the five patients had other findings commonly associated with vocal cord palsy. The extracorporeal membrane oxygenation procedure requires surgical dissection in the carotid sheath on the right side of the neck, an area immediately adjacent to both the vagus and recurrent laryngeal nerve. It is speculated that vocal cord paralysis in these infants was acquired as a result of the extracorporeal membrane oxygenation cannulation. Although the vocal cord paralysis resolved in all cases, two patients had difficult courses after extracorporeal membrane oxygenation. Therefore, laryngoscopic examination should be considered for patients after extracorporeal membrane oxygenation. 相似文献
8.
The aim of this investigation was to establish the relationship between short-term perceived comfort and pressure distribution on the dorsal and plantar surfaces of the foot, while walking in a range of commercially available casual footwear. The study was carried out in the biomechanics laboratory of Manchester Metropolitan University using 15 male subjects without foot pathology. Perceived upper and plantar comfort were measured using a specially designed questionnaire, while dorsal and plantar pressure distributions were measured using a rectangular sensor pad recording at 30 Hz and a Mikro-EMED insole recording at 100 Hz respectively. Analysis of variance tests were used to determine differences in perceived comfort and pressure distribution between three pairs of shoes. The findings of this study suggest that an increase in total plantar force and force-time integral may relate to a decrease in perceived plantar comfort. For the three shoes examined in this study, overall peak plantar pressure, the pressure-time integral, and total plantar area did not appear to be linked to perceived plantar comfort. Findings for the shoe upper indicate that decreased dorsal forces and pressures may be related to decreased upper comfort. These findings suggest that the measurement of pressure distribution at the foot-shoe interface could be a useful tool in identifying the causes of discomfort in footwear. 相似文献
9.
10.