全文获取类型
收费全文 | 76043篇 |
免费 | 7596篇 |
国内免费 | 359篇 |
专业分类
耳鼻咽喉 | 251篇 |
儿科学 | 2694篇 |
妇产科学 | 2009篇 |
基础医学 | 3268篇 |
口腔科学 | 1633篇 |
临床医学 | 24128篇 |
内科学 | 9295篇 |
皮肤病学 | 613篇 |
神经病学 | 3064篇 |
特种医学 | 598篇 |
外科学 | 5915篇 |
综合类 | 5385篇 |
一般理论 | 67篇 |
预防医学 | 16172篇 |
眼科学 | 285篇 |
药学 | 5138篇 |
121篇 | |
中国医学 | 742篇 |
肿瘤学 | 2620篇 |
出版年
2024年 | 172篇 |
2023年 | 2585篇 |
2022年 | 2909篇 |
2021年 | 4344篇 |
2020年 | 4603篇 |
2019年 | 4566篇 |
2018年 | 4277篇 |
2017年 | 3784篇 |
2016年 | 3390篇 |
2015年 | 3244篇 |
2014年 | 5867篇 |
2013年 | 6633篇 |
2012年 | 4324篇 |
2011年 | 4417篇 |
2010年 | 3259篇 |
2009年 | 3383篇 |
2008年 | 3110篇 |
2007年 | 3246篇 |
2006年 | 2729篇 |
2005年 | 2285篇 |
2004年 | 1905篇 |
2003年 | 1468篇 |
2002年 | 1104篇 |
2001年 | 992篇 |
2000年 | 888篇 |
1999年 | 764篇 |
1998年 | 629篇 |
1997年 | 496篇 |
1996年 | 440篇 |
1995年 | 324篇 |
1994年 | 296篇 |
1993年 | 272篇 |
1992年 | 191篇 |
1991年 | 173篇 |
1990年 | 155篇 |
1989年 | 112篇 |
1988年 | 92篇 |
1987年 | 93篇 |
1986年 | 73篇 |
1985年 | 91篇 |
1984年 | 74篇 |
1983年 | 48篇 |
1982年 | 43篇 |
1981年 | 37篇 |
1980年 | 32篇 |
1979年 | 21篇 |
1978年 | 11篇 |
1977年 | 14篇 |
1976年 | 8篇 |
1975年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
《Journal of the American Medical Directors Association》2014,15(3):226.e7-226.e13
ObjectivesUndernutrition in older age is associated with adverse clinical outcomes and high health care costs. This study aimed to evaluate the cost-effectiveness of a dietetic treatment in primary care compared with usual care in older, undernourished, community-dwelling individuals.DesignA parallel randomized controlled trial.SettingPrimary care.ParticipantsA total of 146 undernourished, independently living older (≥65 years) individuals.InterventionDietetic treatment.MeasurementsMain outcomes were change in kilogram body weight compared with baseline and quality-adjusted life years (QALYs) after 6 months. Costs were measured from a societal perspective. The main analysis was performed according to the intention-to-treat principle. Multiple imputation was used to impute missing data and bootstrapping was used to estimate uncertainty surrounding cost differences and incremental cost-effectiveness ratios. Cost-effectiveness planes and cost-effectiveness acceptability curves were estimated.ResultsThe participants were randomized to receive either dietetic treatment (n = 72) or usual care (n = 74). After 6 months, no statistically significant differences were found between the dietetic treatment and usual care group in body weight change (mean difference 0.78 kg, 95% CI −0.26–1.82), QALYs (mean difference 0.001, 95% CI −0.04–0.04) and total costs (mean difference €1645, 95% CI −525–3547). The incremental cost-utility ratio (ICUR) for QALYs was not interpretable. The incremental cost-effectiveness ratio (ICER) for body weight gain was 2111. The probability that dietetic treatment is cost-effective compared with usual care was 0.78 for a ceiling ratio of €5000 for body weight and 0.06 for a ceiling ratio of €20.000 for QALY.ConclusionIn this study, dietetic treatment in older, undernourished, community-dwelling individuals was not cost-effective compared with usual care. 相似文献
992.
《Radiography》2014,20(2):153-157
Using experiences from the South African public healthcare system with limited resources, this review proposes a model that captures a holistic perspective of diagnostic imaging services embedded in a network of negotiated decision-making processes. Professional interdependency and interprofessional collaboration, cooperation and coordination are built around the central notion of integration in order to achieve a seamless transition through the continuum of various types of services needed to come to a diagnosis. Health-system role players interact with patients who enter the system from the perspective of their life-world. The distribution of diagnostic imaging services – within one setting or at multiple levels of care – demonstrates how fragments of information are filtered, interpreted and transformed at each point of care. The proposed model could contribute to alignment towards a common goal: services providing holistic quality of care within and beyond a complex healthcare system. 相似文献
993.
Pablo Vega Fátima Valentín Joaquín Cubiella 《World journal of gastrointestinal oncology》2015,7(12):422-433
Colorectal cancer (CRC) is a major health problem in the Western world. The diagnostic process is a challenge in all health systems for many reasons: There are often no specific symptoms; lower abdominal symptoms are very common and mostly related to non-neoplastic diseases, not CRC; diagnosis of CRC is mainly based on colonoscopy, an invasive procedure; and the resource for diagnosis is usually scarce. Furthermore, the available predictive models for CRC are based on the evaluation of symptoms, and their diagnostic accuracy is limited. Moreover, diagnosis is a complex process involving a sequence of events related to the patient, the initial consulting physician and the health system. Understanding this process is the first step in identifying avoidable factors and reducing the effects of diagnostic delay on the prognosis of CRC. In this article, we describe the predictive value of symptoms for CRC detection. We summarize the available evidence concerning the diagnostic process, as well as the factors implicated in its delay and the methods proposed to reduce it. We describe the different prioritization criteria and predictive models for CRC detection, specifically addressing the two-week wait referral guideline from the National Institute of Clinical Excellence in terms of efficacy, efficiency and diagnostic accuracy. Finally, we collected information on the usefulness of biomarkers, specifically the faecal immunochemical test, as non-invasive diagnostic tests for CRC detection in symptomatic patients. 相似文献
994.
995.
《ALTER. European Journal of Disability research, Journal europeen de recherche sur le handicap》2016,10(2):e1-e13
In this article, I analyze one evolution in disability research over the past 30 years: the shift from an individual to a social approach to disability. While most disability research has currently “socialized” disability or at the least situates disabled people within a social context, not all do so in the same way nor based on the same assumptions. They lead to different concepts of the person and society and different concepts of disability and normalcy. I analyze this evolution by looking at three approaches to disability: the social model, the approach taken in the sociology of science and technology, and the ethics of care. I show how each, by renewing the analysis of disability, has brought about changes for disabled people and transformed ways of “living together” and “making society”. I also show the limits of these approaches and propose lines of thought for the continuation of our research, notably around the question of autonomy. I propose that we rethink autonomy from the standpoint of the notion of “recalcitrance”. 相似文献
996.
To describe the novel use of a bilayer dermal substitute to reconstruct exenterated orbits. A retrospective chart review was performed in the practices of two surgeons (RET and PDL) of all patients who had undergone orbital exenteration between April 2014 and June 2016 and whose subsequent reconstruction included lining the socket with Integra bilayer. Patient demographics, pathologic diagnoses, surgical and post-operative complications, graft integrity, and patient acceptance were recorded. The charts of 7 patients (4 men and 3 women, ages 60–87 years) were reviewed. In all cases, the Integra graft had taken well to the socket bed at the time of silicone removal 3-4 weeks after surgery. Epithelialization of the socket occurred rapidly over the Integra graft (within several weeks) without incident in each case and with minimal postoperative management. No intraoperative or postoperative complications were noted. Integra dermal substitute is an ideal graft for the lining of an exenterated orbit. It is readily available in large quantities, handles easily, lines the socket smoothly, epithelializes rapidly, and requires minimal postoperative care. It offers minimal morbidity compared to skin grafting or free flap reconstruction, but greatly speeds epithelialization compared to laissez faire management. Surgeons should consider reconstructing exenterated orbits with the Integra matrix, both for its ease of use and its ability to epithelialize rapidly. 相似文献
997.
998.
999.
1000.