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   3603篇
  免费   208篇
  国内免费   2篇
耳鼻咽喉   143篇
儿科学   214篇
妇产科学   35篇
基础医学   360篇
口腔科学   153篇
临床医学   327篇
内科学   628篇
皮肤病学   43篇
神经病学   521篇
特种医学   55篇
外科学   465篇
综合类   19篇
一般理论   4篇
预防医学   274篇
眼科学   70篇
药学   171篇
中国医学   1篇
肿瘤学   330篇
  2023年   16篇
  2022年   33篇
  2021年   53篇
  2020年   38篇
  2019年   48篇
  2018年   73篇
  2017年   49篇
  2016年   88篇
  2015年   70篇
  2014年   88篇
  2013年   195篇
  2012年   201篇
  2011年   218篇
  2010年   124篇
  2009年   141篇
  2008年   219篇
  2007年   237篇
  2006年   204篇
  2005年   248篇
  2004年   248篇
  2003年   220篇
  2002年   212篇
  2001年   26篇
  2000年   26篇
  1999年   40篇
  1998年   58篇
  1997年   46篇
  1996年   34篇
  1995年   42篇
  1994年   37篇
  1993年   41篇
  1992年   36篇
  1991年   25篇
  1990年   25篇
  1989年   16篇
  1988年   15篇
  1987年   9篇
  1986年   24篇
  1985年   20篇
  1984年   18篇
  1983年   34篇
  1982年   40篇
  1981年   15篇
  1980年   26篇
  1979年   15篇
  1978年   19篇
  1977年   15篇
  1976年   15篇
  1975年   12篇
  1974年   10篇
排序方式: 共有3813条查询结果,搜索用时 31 毫秒
41.
ObjectiveTo determine the variable burden of disease of patients with advanced estrogen receptor-positive (ER+) breast cancer and assess the current treatment landscape after failure of first-line endocrine therapy.MethodsA comprehensive literature review was performed (2000–2011) by searching Medline via PubMed, and Embase and Cochrane databases, to assess disease burden (i.e. societal, humanistic, and/or economic burden) and treatment landscape for second-line therapy of ER+ advanced breast cancer in postmenopausal women.ResultsOnly 1 study was identified that evaluated burden of disease based on ER status (ER+, ER-negative, or ER-unknown); this study was a subgroup analysis assessing the impact of breast cancer recurrence over 10 years. The investigators reported that only minor differences in survival and medical costs were noted based on ER status in relapsing patients. Regardless of ER status, patients with breast cancer recurrence consumed more healthcare resources and were associated with more costly care than those without recurrence. A total of 7 studies were identified related to treatment outcomes of second-line therapy in ER+ patients. A combined international population totaled >3800 patients who had progressed on prior hormonal therapy, including tamoxifen and aromatase inhibitors. Three trials performed a comparative efficacy/safety assessment of an ER antagonist vs. aromatase inhibitor, 1 trial compared an aromatase inhibitor to megestrol acetate, and 1 trial compared 2 aromatase inhibitors. Among each of the studies evaluated, no significant differences were observed in the primary efficacy endpoint, and the safety profiles were similar. Two additional studies demonstrated a similar or better efficacy and safety profile based on different dosing evaluations.ConclusionsCurrently, there is insufficient evidence on the economic and humanistic burden associated with ER status, and this gap warrants further research. With increasing drug resistance and greater economic burden associated with breast cancer recurrence, there is an unmet medical need for improved treatment in this patient population.  相似文献   
42.
43.
The main purpose of this study was to explore whether subjective perception of interaction with dental staff is associated with dental fear in a population‐based sample of 18‐yr‐old adolescents (= 773). The interaction was measured using the Patient Dental Staff Interaction Questionnaire (PDSIQ), validated with exploratory and confirmatory factor analyses, which yielded the factors of ‘kind atmosphere and mutual communication’, ‘roughness’, ‘insecurity’, ‘trust and safety’, and ‘shame and guilt’. Dental fear was measured using the Modified Dental Anxiety Scale (MDAS). Gender and sense of coherence (SOC) were included as potential confounding variables. Adolescents with high dental fear more often perceived their interaction with dental staff negatively and more often felt insecure than others. This difference persisted after adjustment for gender and SOC. In conclusion, adolescents with high dental fear may perceive their interaction with dental staff more positively if the staff succeed in creating a positive, trusting, approving, and supportive atmosphere with kindness, calmness, and patience. The communication and interaction skills of dental staff may play a particularly important role when encountering highly fearful dental patients.  相似文献   
44.
The effect of sampling site and proximity of malignant tumor on the relative fatty acid composition of human breast adipose tissue was studied in 10 cases of breast cancer. The four anatomic quadrants of breast did not statistically significantly differ from each other in relation to any of the 30 fatty acids studied. Proximity of the malignant tumor did not affect the relative fatty acid composition of fat when compared with more distant sampling sites. Representative samples of breast adipose tissue for fatty acid composition analysis can be obtained from tissue adjacent to the tumor.  相似文献   
45.
The aim was to study the determinants of preventive oral health care need among community‐dwelling old people. The study population consisted of 165 participants, a subpopulation in the Geriatric Multidisciplinary Strategy for Good Care of Elderly People (GeMS) study. Fifty‐five percent of the edentate participants with full dentures and 82% of the dentate had a need for preventive oral health care. In the total study population, the need for preventive care was associated with co‐morbidity (measured by means of the Modified Functional Co‐morbidity Index) odds ratios (OR) 1.2 (confidence intervals [CI] 1.0–1.5), being pre‐frail or frail, OR 2.5 (CI 1.2–5.1), presence of natural teeth, OR 4.8 (CI 2.2–10.4), and among dentate participants, the use of a removable partial denture, OR 12.8 (CI 1.4–114.4). Primary care clinicians should be aware of the high need for preventive care and the importance of nonoral conditions as determinants of preventive oral health care need.  相似文献   
46.
47.
The present population-based study examines associations between epilepsy and autism spectrum disorders (ASD). The cohort includes register data of 4,705 children born between 1987 and 2005 and diagnosed as cases of childhood autism, Asperger’s syndrome or pervasive developmental disorders—not otherwise specified. Each case was matched to four controls by gender, date of birth, place of birth, and residence in Finland. Epilepsy was associated with ASD regardless of the subgroup after adjusting for covariates. The associations were stronger among cases with intellectual disability, especially among females. Epilepsy’s age at onset was similar between the cases and controls regardless of the ASD subgroup. These findings emphasize the importance to examine the neurodevelopmental pathways in ASD, epilepsy and intellectual disability.  相似文献   
48.
Aim: Low birth weight, high birth weight and excessive weight gain after birth may be risk factors for asthma in childhood, but their associations with wheezing in early childhood are poorly studied. The aim of the study was to evaluate birth weight, weight gain in early infancy and overweight in infancy assessed by weight for length (WFL) as risk factors for wheezing after hospitalization for bronchiolitis in early infancy. Methods: In all, 127 full‐term infants hospitalized for bronchiolitis at age <6 months have been followed up until the mean age of 1.5 years. The weights and lengths of the infants were measured on admission to hospital and at the control visit. Birth weights were obtained from the hospital records. Results: Both occurrence and recurrence of post‐bronchiolitis wheezing were associated with birth weight >4000 g and the recurrence of post‐bronchiolitis wheezing with WFL >110% at age 1.5 years. The associations were robust to adjustments with gender and allergy. Higher weight gain from birth to hospitalization at age <6 months was associated with wheezing in the subgroup of children with birth weight >4000 g. Conclusion: High birth weight and the development of overweight may be associated with post‐bronchiolitis wheezing in infancy.  相似文献   
49.
50.
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