全文获取类型
收费全文 | 19705篇 |
免费 | 1545篇 |
国内免费 | 51篇 |
学科分类
医药卫生 | 21301篇 |
出版年
2023年 | 87篇 |
2021年 | 328篇 |
2020年 | 196篇 |
2019年 | 300篇 |
2018年 | 361篇 |
2017年 | 280篇 |
2016年 | 295篇 |
2015年 | 363篇 |
2014年 | 550篇 |
2013年 | 870篇 |
2012年 | 1214篇 |
2011年 | 1363篇 |
2010年 | 715篇 |
2009年 | 642篇 |
2008年 | 1209篇 |
2007年 | 1254篇 |
2006年 | 1230篇 |
2005年 | 1205篇 |
2004年 | 1177篇 |
2003年 | 1056篇 |
2002年 | 1038篇 |
2001年 | 274篇 |
2000年 | 269篇 |
1999年 | 268篇 |
1998年 | 270篇 |
1997年 | 201篇 |
1996年 | 150篇 |
1995年 | 170篇 |
1994年 | 148篇 |
1993年 | 133篇 |
1992年 | 196篇 |
1991年 | 186篇 |
1990年 | 173篇 |
1989年 | 195篇 |
1988年 | 170篇 |
1987年 | 171篇 |
1986年 | 170篇 |
1985年 | 186篇 |
1984年 | 168篇 |
1983年 | 162篇 |
1982年 | 142篇 |
1981年 | 122篇 |
1980年 | 122篇 |
1979年 | 143篇 |
1978年 | 123篇 |
1977年 | 89篇 |
1975年 | 77篇 |
1974年 | 102篇 |
1973年 | 83篇 |
1972年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
1.
Background: Patient feedback is increasingly important in clinical practice, and this should include children’s views. 28 children aged 8–10 years participating in a large-scale OSCE underwent cranial nerve examination by student candidates. They scored each out of 10 for the question: ‘If you had to see a doctor again, how happy would you be to see this one?’ An age-adapted qualitative focus group methodology was used to explore why they scored some students more highly than others.Results: Children’s scores for the 256 medical students ranged from 2 to 10 (median 9; mean 8.46). 76% of scores were above 8. ‘Good' doctor attributes included: ‘friendly’, ‘funny’, ‘knowledgeable’, ‘confident’; ‘bad’ doctor attributes were: ‘making mistakes’, ‘not paying attention’, ‘forgot everything’, ‘serious’. Children’s reasons for specific scores are further explored.Discussion and conclusion: Scores were positively skewed, in line with most patient/simulated patient feedback, and children discriminated between candidates. It should not be assumed that clinician examiners can accurately represent the views of child patients who may value different qualities in doctors. Children participating in our study had clear views of what they want from a doctor: a consultative approach with clear and kind explanation of the process of examination. 相似文献
2.
Heidi J Kalkwarf John A Shepherd Didier Hans Elena Gonzalez Rodriguez Joseph M Kindler Joan M Lappe Sharon Oberfield Karen K Winer Babette S Zemel 《Journal of bone and mineral research》2022,37(4):776-785
Trabecular bone score (TBS) is used for fracture prediction in adults, but its utility in children is limited by absence of appropriate reference values. We aimed to develop reference ranges for TBS by age, sex, and population ancestry for youth ages 5 to 20 years. We also investigated the association between height, body mass index (BMI), and TBS, agreement between TBS and lumbar spine areal bone mineral density (aBMD) and bone mineral apparent density (BMAD) Z-scores, tracking of TBS Z-scores over time, and precision of TBS measurements. We performed secondary analysis of spine dual-energy X-ray absorptiometry (DXA) scans from the Bone Mineral Density in Childhood Study (BMDCS), a mixed longitudinal cohort of healthy children (n = 2014) evaluated at five US centers. TBS was derived using a dedicated TBS algorithm accounting for tissue thickness rather than BMI. TBS increased only during ages corresponding to pubertal development with an earlier increase in females than males. There were no differences in TBS between African Americans and non-African Americans. We provide sex-specific TBS reference ranges and LMS values for calculation of TBS Z-scores by age and means and SD for calculation of Z-scores by pubertal stage. TBS Z-scores were positively associated with height Z-scores at some ages. TBS Z-scores explained only 27% and 17% of the variance of spine aBMD and BMAD Z-scores. Tracking of TBS Z-scores over 6 years was lower (r = 0.47) than for aBMD or BMAD Z-scores (r = 0.74 to 0.79), and precision error of TBS (2.87%) was greater than for aBMD (0.85%) and BMAD (1.22%). In sum, TBS Z-scores provide information distinct from spine aBMD and BMAD Z-scores. Our robust reference ranges for TBS in a well-characterized pediatric cohort and precision error estimates provide essential tools for clinical assessment using TBS and determination of its value in predicting bone fragility in childhood and adolescence. © 2022 American Society for Bone and Mineral Research (ASBMR). 相似文献
3.
Jiménez Isabel Carabia Júlia Bobillo Sabela Palacio Carles Abrisqueta Pau Pagès Carlota Nieto Juan C. Castellví Josep Martínez-Ricarte Francisco Escoda Lourdes Perla Cristóbal Céspedes Torrez Dennis H. Boix Joan Purroy Noelia Puigdefàbregas Lluís Seoane Joan Bosch Francesc Crespo Marta 《Journal of neuro-oncology》2020,149(1):13-25
Journal of Neuro-Oncology - Patients diagnosed with primary central nervous system lymphoma (PCNSL) often face dismal outcomes due to the limited availability of therapeutic options. PCNSL cells... 相似文献
4.
5.
Aim: Older residents in Japan requiring rehabilitation often reside in health‐care facilities for the elderly (HCFE) prior to being discharged to home. The return home can be very stressful for both the elder and family caregiver. The purpose of this study was to clarify the differences in plans for home life between the residents of a HCFE who were scheduled for discharge home and their family caregivers. Method: Semistructured interviews were conducted with eight pairs of elders and caregivers. Results: Differences were seen in several areas, including dietary preferences, recognition of the elder’s independence, preconceptions or not knowing about the elder’s pleasurable activities, and the way of care. Conclusions: Differences with regard to enjoyable activities for the elderly arose from a lack of understanding of the lives of the elderly on the part of their families. 相似文献
6.
7.
Relation between energy expenditure and body composition in man: specific energy expenditure in vivo of fat and fat-free tissue 总被引:2,自引:0,他引:2
L Garby J S Garrow B J?rgensen O Lammert K Madsen P S?rensen J Webster 《European journal of clinical nutrition》1988,42(4):301-305
The relationship between energy expenditure and body composition, in terms of fat and fat-free masses, has previously been described by a variety of predictive regression equations with parameters devoid of physiological content. We present here results obtained by calculating the specific energy expenditure, ie, the energy expenditure per unit of mass, of fat and fat-free tissue on the basis of measurements of the total energy expenditure (EE), the masses of fat (FM), and fat-free (FFM) tissue using the following simple model: EE = k1.FM + k2.FFM where k1 and k2 are the specific energy expenditures of fat and fat-free tissue, respectively. The results of observations on 104 women at rest yielded values for k1 and k2 of 0.31 and 1.35 watts/kg of fat and fat-free mass, respectively, with standard errors of estimate of 0.074 and 0.052 watts/kg, respectively. Analysis of several series of measurements, from other sources and on smaller samples of subjects, yielded similar values at rest but with larger standard errors of estimate. Data from subjects performing varying amounts of work in 24-h measurements showed, as expected, larger values for both tissues. The results explain to a very large extent the well-established relation between resting metabolic rate and body weight, ie, a linear relation with a non-zero intercept. The results also offer a clear-cut explanation for the well known difference in energy expenditure between men and women with the same body weight. 相似文献
8.
9.
Data on 232 members of a single pedigree, descended from two pairs of original parents, were made available to the participants of Genetic Analysis Workshop 8 (GAW8). In addition to information concerning age and sex, measurements for 10 quantitative traits and genotypes at 22 polymorphic marker loci were also provided for a subset of 193 of these family members. © 1993 Wiley-Liss, Inc. 相似文献
10.