全文获取类型
收费全文 | 568篇 |
免费 | 26篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 33篇 |
妇产科学 | 8篇 |
基础医学 | 57篇 |
口腔科学 | 16篇 |
临床医学 | 84篇 |
内科学 | 119篇 |
皮肤病学 | 32篇 |
神经病学 | 13篇 |
特种医学 | 123篇 |
外科学 | 16篇 |
综合类 | 22篇 |
预防医学 | 31篇 |
眼科学 | 4篇 |
药学 | 14篇 |
1篇 | |
肿瘤学 | 23篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 8篇 |
2017年 | 2篇 |
2016年 | 9篇 |
2015年 | 10篇 |
2014年 | 12篇 |
2013年 | 15篇 |
2012年 | 6篇 |
2011年 | 16篇 |
2010年 | 27篇 |
2009年 | 28篇 |
2008年 | 10篇 |
2007年 | 22篇 |
2006年 | 16篇 |
2005年 | 15篇 |
2004年 | 8篇 |
2003年 | 4篇 |
2002年 | 8篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1998年 | 37篇 |
1997年 | 45篇 |
1996年 | 38篇 |
1995年 | 19篇 |
1994年 | 29篇 |
1993年 | 22篇 |
1992年 | 9篇 |
1991年 | 9篇 |
1990年 | 11篇 |
1989年 | 22篇 |
1988年 | 20篇 |
1987年 | 9篇 |
1986年 | 8篇 |
1985年 | 5篇 |
1984年 | 14篇 |
1983年 | 14篇 |
1982年 | 12篇 |
1981年 | 11篇 |
1980年 | 7篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1969年 | 1篇 |
排序方式: 共有599条查询结果,搜索用时 31 毫秒
81.
82.
83.
Murakami T; Baron RL; Peterson MS; Oliver JH rd; Davis PL; Confer SR; Federle MP 《Radiology》1996,200(1):69
84.
J-B Liu† M Li‡§ H Chen† S-Q Zhong† S Yang¶ W-D Du¶ J-H Hao†† T-S Zhang‡‡ X-J Zhang¶ MP Zeegers§§¶¶ 《Journal of the European Academy of Dermatology and Venereology》2007,21(2):205-213
BACKGROUND: Linkage and association studies suggest that the human leucocyte antigen (HLA) region may be involved in the genetic susceptibility of vitiligo. HLA-A2 has been reported to be associated with vitiligo in some, but not all, studies. OBJECTIVE: To identify sources of the heterogeneity among studies and to quantify effect estimates, we examined the association of HLA-A2 with vitiligo in a meta-analysis of all observational studies comparing the frequencies of HLA-A2 between vitiligo individuals and controls during 1966-2005. METHODS: The summary odds ratio (OR) was calculated by using a fixed- or a random-effects model. Meta-regression analysis was undertaken to investigate the effects of study characteristics on the pooled OR. RESULTS: Eleven case-controlled studies fulfilled our inclusion criteria. The studies identified a total of 777 patients and 4820 controls. Meta-analysis showed a significantly increased frequency of HLA-A2 in vitiligo among cases [OR = 2.07, 95% confidence interval (CI) 1.67-2.58]. Heterogeneity was explained by the quality of the study and the ethnic background of the participants. Meta-regression analysis further showed that the percentage of familial vitiligo among the subjects had a significant effect on the pooled OR (P = 0.008). No study had a significant effect on the pooled OR and no publication bias presented in the studies analysed (P = 0.688). CONCLUSION: These findings strongly suggest an association between HLA-A2 and vitiligo. 相似文献
85.
X-linked hypophosphatemia in adults: prevalence of skeletal radiographic and scintigraphic features 总被引:3,自引:0,他引:3
The radiologic studies of 38 essentially untreated adults with X-linked hypophosphatemia (XLH) were reviewed to determine the prevalence of radiologic features, to compare the findings in men and in women, and to elucidate the natural history of the disease by comparing the findings in young, intermediate-age, and older patients. Bone-reinforcement lines were common, but no characteristic mineral mass alteration was established. Looser zones were more prevalent in older subjects. Osteoarthritis was common, occurring in the ankles, knees, feet, sacroiliac joints, and wrists. Enthesopathy was infrequent in the younger group but was present in every member of the intermediate and older groups and was often accompanied by extra ossicles. Curvatures of the lower-extremity long bones were common in all age groups. Three new skeletal alterations in XLH were found to be common: flaring of the iliac wings, trapezoidal distal femoral condyles, and alterations in talar morphology, including shortening of the talar neck and flattening of the talar dome. Technetium-99m methylene diphosphonate scintigrams of 17 subjects were often abnormal, depicting bowing deformity and focal tracer accumulation in diaphyseal cortices and in periarticular and extraarticular regions. The mean metabolic index was moderately elevated (4.0). Both radiographic and scintigraphic findings were more severe in men, consistent with hemizygosity. The natural history of untreated XLH in both sexes is characterized by the development of a variety of age-related skeletal abnormalities during adulthood. 相似文献
86.
87.
88.
Women worried about their familial breast cancer risk--a study on genetic advice in general practice
de Bock GH; Perk DC; Oosterwijk JC; Hageman GC; Kievit J; Springer MP 《Family practice》1997,14(1):40-43
AIMS: To ascertain whether women who consulted their GP because they
perceived themselves as at increased risk of familial breast cancer were
indeed at increased risk, and to evaluate potential strategies for
assessing genetic risk of breast cancer in general practice. METHODS:
Sixty-seven out of 81 women who had consulted their GP for advice about
their possible increased risk of developing breast cancer due to breast
cancer in the family were interviewed. Familial breast cancer risk was
assessed by a clinical geneticist. This assessment was compared with two
recent guidelines for referral for genetic counselling. RESULTS: More than
half (52%; n = 35) the women had a relative risk of two and over for
developing breast cancer, while another half of these 35 (25%; n = 17) had
a relative risk of three and over. All the women (n = 17) with a relative
risk of three and over were identified by means of the two current
guidelines for referral for genetic counselling, while more than half of
the women (61%; n = 11) with a relative risk between two and three were
identified. CONCLUSIONS: More than half the women concerned about their
familial risk of breast cancer are indeed at increased risk of breast
cancer. Current guidelines correctly identify women at high risk. However,
doubts about the health gain and feasibility of referral warrant caution,
and need further investigation.
相似文献
89.
To calculate the centre of pressure using piezoelectric force plates mounted on pads, no net tensile stresses may be imposed on the surface of the plate. This condition is violated when stairs are attached to the plates, unless the plates are preloaded. Typical shear forces encountered when climbing stairs were used to determine required preloads of approximately 16.4 N/cm step height. Vertical and horizontal loads were applied at known locations on the steps, and points of application were calculated. Deviations were within ± 3 mm. The effect of point of application inaccuracy on calculated joint moments is considerable. A 2 cm medial shift in the point of application resulted in calculated peak knee abduction/adduction moment errors of 35%. 相似文献
90.
Gray-scale sonographic spectrum of hypernephromas 总被引:1,自引:0,他引:1