首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2329篇
  免费   63篇
  国内免费   3篇
耳鼻咽喉   5篇
儿科学   63篇
妇产科学   226篇
基础医学   58篇
口腔科学   34篇
临床医学   537篇
内科学   304篇
皮肤病学   31篇
神经病学   103篇
特种医学   37篇
外科学   127篇
综合类   138篇
预防医学   553篇
眼科学   32篇
药学   100篇
中国医学   10篇
肿瘤学   37篇
  2023年   72篇
  2022年   92篇
  2021年   109篇
  2020年   99篇
  2019年   200篇
  2018年   173篇
  2017年   109篇
  2016年   58篇
  2015年   45篇
  2014年   194篇
  2013年   169篇
  2012年   92篇
  2011年   139篇
  2010年   173篇
  2009年   78篇
  2008年   75篇
  2007年   90篇
  2006年   62篇
  2005年   42篇
  2004年   22篇
  2003年   11篇
  2002年   20篇
  2001年   18篇
  2000年   24篇
  1999年   15篇
  1998年   5篇
  1997年   5篇
  1996年   4篇
  1994年   5篇
  1993年   2篇
  1992年   2篇
  1991年   1篇
  1988年   1篇
  1987年   1篇
  1985年   17篇
  1984年   32篇
  1983年   15篇
  1982年   18篇
  1981年   18篇
  1980年   18篇
  1979年   17篇
  1978年   8篇
  1977年   9篇
  1976年   9篇
  1975年   7篇
  1974年   7篇
  1973年   12篇
  1972年   1篇
排序方式: 共有2395条查询结果,搜索用时 156 毫秒
31.
32.
了解各国助产人员从事助产服务情况及我国助产的政策、执业范围、助产教育,旨在积极倡导助产改革,制定新的助产政策。认为政府应重新认识助产士职能,在循证的基础上改革助产政策,促进中国助产专业的发展和母婴健康。  相似文献   
33.
34.
35.
From The Editor     
No abstract available for this article.  相似文献   
36.
BackgroundThere is evidence that continuity models of midwifery care benefit women and babies in terms of less birth interventions and higher maternal satisfaction. Studies about continuity models in a Swedish context are lacking.ObjectiveThe aim of this study was to describe how women experience continuity of midwifery care in a Swedish rural area, and thereby provide a deeper understanding of what this care entails for women.MethodsA qualitative interview study using thematic analysis was carried out. Telephone interviews were conducted with 33 women who participated in a continuity of midwifery care project in a rural area of Sweden.ResultsThe overarching theme ‘a longing for a sense of security’, pervaded the three main themes: ‘The importance of professional midwifery care’, ‘Continuity of midwifery – fulfilled expectations or full of disappointments’ and ‘New prerequisites – acceptable to some, but not a substitute for everyone’, which explains different aspects affecting the feeling of security. The endeavour to feel secure during pregnancy, birth and postpartum was a continually recurring subject that cannot be overstated.ConclusionContinuity of midwifery care strengthened women’s feelings of security during pregnancy, birth and postpartum. The deepened relationship developed over time was a central part of the positive aspects of the experience of continuity in midwifery care. Expectations and prerequisite circumstances are important to consider when developing and introducing new care models. Service providers and decision makers should pay attention to and prioritise this relational aspect when planning care for women during the childbearing period.  相似文献   
37.

Objective

There is limited research on the association between phthalates and metabolic syndrome (MetS). Among adolescents, phthalate exposure, which can occur from multiple sources, has been linked to several risk factors for MetS. The objective was to investigate the association between urinary phthalate metabolite concentrations (i.e., mono-ethyl phthalate (MEP), mono-n-butyl phthalate (MnBP), mono-isobutyl phthalate (MiBP), mono-benzyl phthalate (MBzP), mono-(3-carboxylpropyl) phthalate (MCPP), and di(2-ethylhexyl phthalate (DEHP)) and MetS in adolescents aged 12–19 years using the National Health and Nutrition Examination Survey (NHANES) data (2003–2014). A secondary aim was to assess if observed associations varied by a measure of socioeconomic status, economic adversity, which was defined using parental income and educational attainment as well as household food security.

Methods

We used NHANES data which included physical examination, laboratory urinalysis and fasting blood profiles, and self-reported health characteristics and demographics. Physical examination and laboratory data were used to obtain values of MetS components and urinary phthalate metabolites. We created age-, sex-, and survey year-specific tertiles of creatinine-corrected urinary phthalate metabolites. Analysis was performed using appropriate weighting procedures that accounted for NHANES' complex sampling design. After univariate and bivariate analyses, we performed adjusted logistic regressions to test for associations between individual phthalate metabolites and MetS as well as MetS components and number of MetS components, separately, using the lowest tertile as the reference category. A cross-product term (phthalate metabolite*economic adversity) was subsequently added to adjusted models.

Results

Among 918 participants (mean age 16 years, 45% female, 18% with economic adversity), the prevalence of MetS was 5.3%. Prior to adjustment, adolescents with MetS had marginally higher concentrations of phthalate metabolites than adolescents without MetS. There was a suggestive positive association between intermediate concentrations of MnBP and odds of MetS after adjustment (T2: Odds Ratio (OR)?=?2.66 (95% confidence interval: 0.98–7.24); T3: OR?=?2.11 (0.71–6.27)). Males with higher MnBP concentrations had higher odds of dyslipidemia; however, associations were mostly non-significant for females. Relationships between MiBP concentrations and odds of MetS varied by sex. Males with higher concentrations of MnBP and MiBP had greater odds of having a higher number of MetS components. Relationships between phthalate metabolites and MetS did not vary by economic adversity.

Conclusion

There was a suggestive positive association between MnBP and MetS among adolescents. Associations between phthalate metabolites and MetS as well as MetS components may vary by sex, but may not vary by economic adversity. Further research of the relationships between phthalate exposures, MetS, and potential interactions with socioeconomic factors is warranted.  相似文献   
38.
ObjectivesThis study aimed to estimate prehospital delay and to identify the factors associated with the late arrival of patients with ischemic stroke at the Souss Massa Regional Hospital Center in Morocco.Patients and methodsAn observational, prospective, cross-sectional study was conducted from March 2019 to September 2019 in the Souss Massa regional hospital center, which is a public hospital structure. A questionnaire was administered to patients with ischemic stroke and to bystanders (family or others), while clinical and paraclinical data were collected from medical records. Univariate and multivariate logistic regression analyses were used to identify the factors associated with delayed arrival at emergency department.ResultsA total of 197 patients and 197 bystanders who fulfilled the criteria for the study were included. The median time from symptom onset to hospital arrival was 6 hours (IQR, 4–16). Multiple regression analysis showed that illiteracy (OR 38.58; CI95%: 3.40–437.27), waiting for symptoms to disappear (patient behavior) (OR 11.24; CI95%: 1.57–80.45), deciding to go directly to the hospital (patient behavior) (OR 0.07; CI95%: 0.01–0.57), bystander's knowledge that stroke is a disease requiring urgent care within a limited therapeutic window (OR 0.005; CI95%: 0.00–0.36), and direct admission without reference (OR 0.005; CI95%: 0.00–0.07), were independently associated with late arrival (> 4.5 hours) of patients with acute ischemic stroke. In addition, illiteracy (OR 24.62; CI95%: 4.37–138.69), vertigo and disturbance of balance or coordination (OR 0.14; CI95%: 0.03–0.73), the relative's knowledge that stroke is a disease requiring urgent care and within a limited therapeutic window (OR 0.03; CI95%: 0.00–0.22), calling for an ambulance (relative's behavior) (OR 0.16; CI95%: 0.03–0.80), distance between 50 and 100 km (OR 10.16; CI95%: 1.16–89.33), and direct admission without reference (OR 0.03; CI95%: 0.00–0.14), were independently associated with late arrival (> 6 hours) of patients with acute ischemic stroke.ConclusionPatient behavior, bystander knowledge and direct admission to the competent hospital for stroke care are modifiable factors potentially useful for reducing onset-to-door time, and thereby increasing the implementation rates of acute stroke therapies.  相似文献   
39.
Within the United Kingdom, the statutory supervision of midwives has a central role in both the provision of safe, high-quality maternity services and in the regulation of midwifery practice. Despite its long history, little is currently known about how midwives and their supervisors perceive and experience the statutory supervisory process.  相似文献   
40.
To record the variation of perceptions of midwifery faculty in terms of the possibilities and challenges related to the completion of their first online master's level programme in Sexual and Reproductive Health and Rights in Somaliland. The informants included in this phenomenongraphical focus group study were those well-educated professional women and men who completed the master's program. The informant perceived that this first online master's level programme provided tools for independent use of the Internet and independent searching for evidence-based information, enhanced professional development, was challenge-driven and evoked curiosity, challenged professional development, enhanced personal development and challenged context-bound career paths. Online education makes it possible for well-educated professional women to continue higher education. It furthermore increased the informants' confidence in their use of Internet, software and databases and in the use of evidence in both their teaching and their clinical practice. Programmes such as the one described in this paper could counter the difficulties ensuring best practice by having a critical mass of midwives who will be able to continually gather contemporary midwifery evidence and use it to ensure best practice. An increase of online education is suggested in South-central Somalia and in similar settings globally.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号