全文获取类型
收费全文 | 4697篇 |
免费 | 507篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 23篇 |
儿科学 | 137篇 |
妇产科学 | 54篇 |
基础医学 | 436篇 |
口腔科学 | 135篇 |
临床医学 | 659篇 |
内科学 | 1241篇 |
皮肤病学 | 67篇 |
神经病学 | 260篇 |
特种医学 | 494篇 |
外科学 | 564篇 |
综合类 | 65篇 |
一般理论 | 2篇 |
预防医学 | 521篇 |
眼科学 | 71篇 |
药学 | 241篇 |
肿瘤学 | 258篇 |
出版年
2023年 | 58篇 |
2021年 | 64篇 |
2020年 | 56篇 |
2019年 | 51篇 |
2018年 | 88篇 |
2017年 | 55篇 |
2016年 | 67篇 |
2015年 | 82篇 |
2014年 | 201篇 |
2013年 | 230篇 |
2012年 | 169篇 |
2011年 | 181篇 |
2010年 | 125篇 |
2009年 | 135篇 |
2008年 | 156篇 |
2007年 | 197篇 |
2006年 | 163篇 |
2005年 | 176篇 |
2004年 | 175篇 |
2003年 | 121篇 |
2002年 | 134篇 |
2001年 | 125篇 |
2000年 | 131篇 |
1999年 | 112篇 |
1998年 | 98篇 |
1997年 | 120篇 |
1996年 | 108篇 |
1995年 | 88篇 |
1994年 | 81篇 |
1993年 | 67篇 |
1992年 | 85篇 |
1991年 | 90篇 |
1990年 | 102篇 |
1989年 | 135篇 |
1988年 | 121篇 |
1987年 | 93篇 |
1986年 | 93篇 |
1985年 | 86篇 |
1984年 | 54篇 |
1983年 | 51篇 |
1982年 | 53篇 |
1981年 | 48篇 |
1980年 | 46篇 |
1979年 | 74篇 |
1978年 | 46篇 |
1977年 | 49篇 |
1976年 | 38篇 |
1974年 | 37篇 |
1973年 | 35篇 |
1971年 | 31篇 |
排序方式: 共有5228条查询结果,搜索用时 15 毫秒
182.
183.
184.
185.
Impact of Breast Density Legislation on Breast Cancer Risk Assessment and Supplemental Screening: A Survey of 110 Radiology Facilities
下载免费PDF全文
![点击此处可从《The breast journal》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Lina Nayak MD Kanae K. Miyake MD PhD Jessica W. T. Leung MD Elissa R. Price MD Yueyi I. Liu MD PhD Bonnie N. Joe MD PhD Edward A. Sickles MD William R. Thomas MD Jafi A. Lipson MD Bruce L. Daniel MD Jonathan Hargreaves MD R. James Brenner MD JD Lawrence W. Bassett MD Haydee Ojeda‐Fournier MD Karen K. Lindfors MD MPH Stephen A. Feig MD Debra M. Ikeda MD 《The breast journal》2016,22(5):493-500
Breast density notification laws, passed in 19 states as of October 2014, mandate that patients be informed of their breast density. The purpose of this study is to assess the impact of this legislation on radiology practices, including performance of breast cancer risk assessment and supplemental screening studies. A 20‐question anonymous web‐based survey was emailed to radiologists in the Society of Breast Imaging between August 2013 and March 2014. Statistical analysis was performed using Fisher's exact test. Around 121 radiologists from 110 facilities in 34 USA states and 1 Canadian site responded. About 50% (55/110) of facilities had breast density legislation, 36% of facilities (39/109) performed breast cancer risk assessment (one facility did not respond). Risk assessment was performed as a new task in response to density legislation in 40% (6/15) of facilities in states with notification laws. However, there was no significant difference in performing risk assessment between facilities in states with a law and those without (p < 0.831). In anticipation of breast density legislation, 33% (16/48), 6% (3/48), and 6% (3/48) of facilities in states with laws implemented handheld whole breast ultrasound (WBUS), automated WBUS, and tomosynthesis, respectively. The ratio of facilities offering handheld WBUS was significantly higher in states with a law than in states without (p < 0.001). In response to breast density legislation, more than 33% of facilities are offering supplemental screening with WBUS and tomosynthesis, and many are performing formal risk assessment for determining patient management. 相似文献
186.
187.
To provide an animal model of human exotropia, a free tenotomy of the medial recti was performed in two infant macaques. When the animals were old enough to record eye movements with video eye trackers, we measured their ductions, ocular alignment, comitance, smooth pursuit, fixation preference, and gaze stability. Partial recovery of adduction occurred in each monkey from spontaneous re-attachment of the medial rectus muscle to the eye. However, each animal was left with a relatively comitant, large angle exotropia. The magnitude of the exotropia was not affected by covering one eye. There was no dissociated vertical deviation or any significant "A" or "V" pattern to the horizontal misalignment. Smooth pursuit was more accurate when tracking nasally compared with temporally in both animals. Compensatory catch-up saccades in the tracking eye were always accompanied by conjugate movements in the deviated eye. Despite tenotomy of the medial recti, the velocity of adducting saccades was normal. Both monkeys alternated fixation, preferring to use the left eye for targets on the left side and the right eye for targets on the right. Each animal was capable of switching fixation while making accurate saccades. One of the monkeys developed a vertical pendular nystagmus, which was most prominent in the deviated eye. Macaques with ocular misalignment from medial rectus tenotomy exhibit features that are present in humans with alternating exotropia. These animals will be valuable for probing the cortical mechanisms that underlie visual suppression in strabismus. 相似文献
188.
Using CollaboRATE,a brief patient‐reported measure of shared decision making: Results from three clinical settings in the United States
下载免费PDF全文
![点击此处可从《Health expectations》网站下载免费的PDF全文](/ch/ext_images/free.gif)
189.
To optimally demonstrate the value of risk management, our actions must show the benefits. The American Society for Healthcare Risk Management (ASHRM) board needs to provide support through tools and resources. ASHRM members must show through their actions the value of risk management. And ASHRM members need to show the organization where actions and activities should be focused in the future. Actions show the value of enterprise risk management. 相似文献
190.