全文获取类型
收费全文 | 51744篇 |
免费 | 4263篇 |
国内免费 | 1563篇 |
专业分类
耳鼻咽喉 | 626篇 |
儿科学 | 617篇 |
妇产科学 | 1084篇 |
基础医学 | 8043篇 |
口腔科学 | 1413篇 |
临床医学 | 4203篇 |
内科学 | 9927篇 |
皮肤病学 | 1005篇 |
神经病学 | 3728篇 |
特种医学 | 1700篇 |
外国民族医学 | 6篇 |
外科学 | 7257篇 |
综合类 | 4016篇 |
一般理论 | 5篇 |
预防医学 | 2879篇 |
眼科学 | 1358篇 |
药学 | 4640篇 |
中国医学 | 761篇 |
肿瘤学 | 4302篇 |
出版年
2023年 | 181篇 |
2022年 | 239篇 |
2021年 | 453篇 |
2020年 | 343篇 |
2019年 | 594篇 |
2018年 | 1017篇 |
2017年 | 801篇 |
2016年 | 825篇 |
2015年 | 938篇 |
2014年 | 1289篇 |
2013年 | 1568篇 |
2012年 | 2154篇 |
2011年 | 2083篇 |
2010年 | 1252篇 |
2009年 | 1228篇 |
2008年 | 1837篇 |
2007年 | 1951篇 |
2006年 | 1808篇 |
2005年 | 1491篇 |
2004年 | 1357篇 |
2003年 | 1327篇 |
2002年 | 1265篇 |
2001年 | 4627篇 |
2000年 | 4541篇 |
1999年 | 3903篇 |
1998年 | 1351篇 |
1997年 | 977篇 |
1996年 | 573篇 |
1995年 | 501篇 |
1994年 | 452篇 |
1993年 | 413篇 |
1992年 | 1934篇 |
1991年 | 1671篇 |
1990年 | 1504篇 |
1989年 | 1482篇 |
1988年 | 1299篇 |
1987年 | 1191篇 |
1986年 | 1064篇 |
1985年 | 900篇 |
1984年 | 588篇 |
1983年 | 468篇 |
1982年 | 248篇 |
1981年 | 180篇 |
1980年 | 140篇 |
1979年 | 280篇 |
1978年 | 77篇 |
1974年 | 75篇 |
1973年 | 95篇 |
1972年 | 71篇 |
1969年 | 66篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Edwin Jabbari Shunsuke Koga Rebecca R Valentino Regina H Reynolds Raffaele Ferrari Manuela M X Tan James B Rowe Clifton L Dalgard Sonja W Scholz Dennis W Dickson Thomas T Warner Tamas Revesz Günter U Höglinger Owen A Ross Mina Ryten John Hardy Maryam Shoai Huw R Morris 《Lancet neurology》2021,20(2):107-116
2.
Lai Daniel W. L. Chan K. C. Daoust G. D. Xie X. J. 《Community mental health journal》2021,57(8):1556-1565
Community Mental Health Journal - Recovery is a progressive process involving support to people with mental illness to take control of their life through the enhancement of motivation, self-drive,... 相似文献
3.
4.
5.
Q. Wen J. Ma X. Pang S. Huang J. Zhang J. Wang X. Chang J. Guo W. Zhang 《Revue neurologique》2021,177(6):639-646
ObjectiveIn this study, we aimed to select the best diaphragm ultrasonography (DUS) parameter as an alternative index for the diagnosis of lung function impairment in amyotrophic lateral sclerosis (ALS).MethodsTwenty-nine patients with ALS and 15 healthy subjects were enrolled in the study. DUS, lung function tests, phrenic nerve conduction study and arterial blood gas analysis were performed.ResultsPatients with respiratory dysfunction had a significantly lower level of ΔTmax than those without (P = 0.039). Significant correlations (P < 0.05) were found between forced vital capacity (FVC) and Tdi-ins (r = 0.665, P < 0.0001) and ΔTmax (r = ?0.748, P < 0.0001) and Δins-exp (r = 0.627, P < 0.0001) and ΔTdi (r = 0.485, P < 0.0001). Receiver Operating Curves analysis demonstrated that ΔTmax (AUC = 0.76, P = 0.044) had a better overall accuracy for detection of respiratory dysfunction compared with Tdi-ins (AUC = 0.27, P = 0.067), Δins-exp (AUC = 0.312, P = 0.139), and ΔTdi (AUC = 0.38, P = 0.359).ConclusionΔTmax is the most valuable DUS index in the diagnosis of diaphragmatic dysfunction.SignificanceDUS can provide functional and structural information of diaphragm and help to diagnose diaphragmatic dysfunction in ALS. 相似文献
6.
Whitley W. Aamodt MD MPH Teresa Waligorska MSc Junchao Shen BS Thomas F. Tropea DO MPH MSTR Andrew Siderowf MD MSCE Daniel Weintraub MD Murray Grossman MD David Irwin MD MSTR David A. Wolk MD Sharon X. Xie PhD John Q. Trojanowski MD PhD Leslie M. Shaw PhD Alice S. Chen-Plotkin MD 《Movement disorders》2021,36(12):2945-2950
7.
8.
X. Lu A.J. Forte F. Fan Z. Zhang L. Teng B. Yang M. Alperovich D.M. Steinbacher N. Alonso J.A. Persing 《The British journal of oral & maxillofacial surgery》2021,59(5):579-585
The altered orbital morphology of patients with Crouzon syndrome could have an impact on the planning of treatment in diverse populations, in spite of the confounding influences of different cranial suture synostosis. This study attempted to explore the differences in orbital characteristics between Asian, Caucasian patients with Crouzon syndrome, associated pansynostosis. Eighty-six preoperative computed tomograms (CT) were included (Asian Crouzon syndrome: n=10; Asian controls: n=24; Caucasian Crouzon syndrome: n=19; Caucasian controls: n=33) and measured using Mimics software (Materialise). Unique cephalometric measurements related to orbital morphology and position were designed. Crouzon syndrome and race both have interactive effects on protrusion of the globe (p=0.009) and medial horizontal angle (p=0.012) in the assessment of orbital morphology. They also interact in the width of the ethmoid sinus (p=0.009) and influence bilateral orbital relations. The anteroposterior orbital roof in Caucasian patients with Crouzon syndrome was shortened by 4.09 mm (p=0.002) compared with Caucasian controls. However, in Asian patients this dimension developed normally. The anteroposterior orbital floor was significantly reduced to a similar extent in both Asian and Caucasian Crouzon patients (both p<0.001). The visual axes in Caucasian patients with Crouzon showed more inferior rotation, by 4.38° (p=0.031) than they did in Caucasian controls, but did not achieve a statistically significant difference in other comparisons. The effect of Crouzon syndrome on orbital malformation and placement is influenced by race, especially structures related to the ethmoid sinus. Asian patients need greater infraorbital advancement for better correction of orbital proptosis and aesthetic benefits, but may require less fronto-orbital advancement than Caucasian patients. 相似文献
9.
M. Xiao H. Song Y. You M. Liu X. Yang Y. Wang 《International journal of oral and maxillofacial surgery》2021,50(4):437-443
Parotid lymph node (PLN) metastasis greatly worsens the prognosis of patients with oral squamous cell carcinoma (OSCC) and poses a great challenge for further treatment of OSCC. The clinicopathological characteristics and treatment strategies for PLN metastasis from OSCC need to be comprehensively elucidated. A retrospective review of OSCC patients who experienced postoperative PLN metastasis in our department between 2000 and 2018 was performed in this study. A total of 47 OSCC patients with postoperative PLN metastasis were identified. PLN with metastasis were divided into three groups based on the location: parotid tail (PLN-t), superficial lobe (PLN-sl), and deep lobe (PLN-dl). Most of the patients experienced PLN metastasis within less than 12 months after the primary surgery for OSCC. Comparatively, patients with PLN-sl metastasis were more prone to have infiltration of the facial nerve. The tongue and buccal mucosa were the most frequent primary sites associated with PLN metastasis from OSCC. PLNs in the parotid tail were most commonly affected by the metastasized OSCC. Consequently, we recommend a series of strategies for the prevention and treatment of PLN metastasis for OSCC patients. In conclusion, PLNs should not be overlooked during preoperative evaluation and postoperative follow-up examinations for OSCC patients. 相似文献
10.
M. Wang A. Abdelrehem X. Qu C. Zhang 《International journal of oral and maxillofacial surgery》2021,50(3):391-397
The objective of this study was to compare the implant longevity following two methods of peri-implant soft tissue optimization following free fibula flap (FFF): thinning of skin paddle (SP) and collagen matrix (CM). All patients who underwent rehabilitation with dental implants after mandibular reconstruction with FFF between June 2009 to May 2014 were retrospectively reviewed. Two methods of peri-implant soft tissue optimization were applied: (1) SP group, (2) CM group. Outcome measurements were: modified plaque index (mPI), modified sulcus bleeding index (mSBI), probing depth (PD), marginal bone loss (MBL), implant success rate and complication rates. A total of 24 patients with 69 implants were included in the study, with 8.7% (n = 6) of implants lost in 3 years. No statistically significant difference was found regarding the outcome measurements in both groups. Failed implants presented with statistically significant higher mPI, mSBI, PD and MBL scores during prosthesis delivery and subsequent follow-ups (P<0.03). In the SP group, one patient experienced SP necrosis which later underwent soft tissue optimization using CM. CM is an alternative peri-implant soft tissue, while thinning of SP is feasible if thickness is well controlled. 相似文献