全文获取类型
收费全文 | 339993篇 |
免费 | 8371篇 |
国内免费 | 242篇 |
专业分类
耳鼻咽喉 | 3518篇 |
儿科学 | 12971篇 |
妇产科学 | 7829篇 |
基础医学 | 41003篇 |
口腔科学 | 5116篇 |
临床医学 | 23628篇 |
内科学 | 62958篇 |
皮肤病学 | 4718篇 |
神经病学 | 29147篇 |
特种医学 | 15454篇 |
外国民族医学 | 32篇 |
外科学 | 57190篇 |
综合类 | 4512篇 |
一般理论 | 37篇 |
预防医学 | 26893篇 |
眼科学 | 6845篇 |
药学 | 20075篇 |
1篇 | |
中国医学 | 988篇 |
肿瘤学 | 25691篇 |
出版年
2021年 | 1229篇 |
2019年 | 1238篇 |
2018年 | 25648篇 |
2017年 | 20540篇 |
2016年 | 24110篇 |
2015年 | 2854篇 |
2014年 | 3294篇 |
2013年 | 4177篇 |
2012年 | 12047篇 |
2011年 | 27716篇 |
2010年 | 22991篇 |
2009年 | 15533篇 |
2008年 | 27139篇 |
2007年 | 31123篇 |
2006年 | 5480篇 |
2005年 | 7960篇 |
2004年 | 9375篇 |
2003年 | 10950篇 |
2002年 | 8394篇 |
2001年 | 7622篇 |
2000年 | 7863篇 |
1999年 | 6321篇 |
1998年 | 2109篇 |
1997年 | 2070篇 |
1996年 | 1654篇 |
1995年 | 1527篇 |
1994年 | 1426篇 |
1993年 | 1410篇 |
1992年 | 4039篇 |
1991年 | 3855篇 |
1990年 | 3838篇 |
1989年 | 3572篇 |
1988年 | 3190篇 |
1987年 | 3091篇 |
1986年 | 2986篇 |
1985年 | 2806篇 |
1984年 | 2101篇 |
1983年 | 1735篇 |
1982年 | 1094篇 |
1981年 | 997篇 |
1980年 | 945篇 |
1979年 | 1977篇 |
1978年 | 1458篇 |
1977年 | 1174篇 |
1976年 | 1044篇 |
1975年 | 1209篇 |
1974年 | 1281篇 |
1973年 | 1242篇 |
1972年 | 1061篇 |
1971年 | 996篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
Laurent Boyer Patrice Francois Elisabeth Doutre Georges Weil Jose Labarere 《International journal for quality in health care》2006,18(5):359-364
OBJECTIVE: . The aim of this study was to assess clinical staff's opinions on the results of in-patient satisfaction surveys and their use within the quality improvement process. SETTING: The institution is a 2200-bed teaching hospital of tertiary health care employing 8000 professionals. Patient satisfaction surveys are carried out each year using a validated questionnaire mailed to a random sample of patients. The specific results of each department are sent to the medical and paramedical managers. METHODS: We conducted a questionnaire survey on 500 care providers randomly selected in every medical and surgical department. RESULTS: A total of 261 questionnaires were returned and analysed. Overall, 94% of responders had a favourable opinion of the patient satisfaction surveys. They considered that the patient was able to judge hospital service quality, especially in its relational, organizational, and environmental dimensions. The specific results for the department were less well known than the overall hospital results (60 versus 76%). These results were formally discussed in the department according to 40% of responders; 40% declared that these data resulted in improvement actions and considered that they led to modifications in their behaviour with patients. CONCLUSIONS: Despite a declared interest in satisfaction surveys, the results remain underused by hospital staff and insufficiently discussed within teams. 相似文献
73.
K P Sylvester S R Desai A U Wells D M Hansell M Awogbade S L Thein A Greenough 《The European respiratory journal》2006,28(4):832-838
The aim of this study was to determine whether patients with sickle cell disease (SCD) in steady state had pulmonary abnormalities seen on high-resolution computed tomography (HRCT) and whether any abnormalities correlated with contemporaneously diagnosed lung function abnormalities. A subsidiary question was whether the results of a noninvasive measure of haemolysis (end-tidal carbon monoxide (ETCO) levels) correlated with pulmonary function abnormalities. Thirty three patients with SCD, median (range) age 36 yrs (17-67 yrs) were examined. The degree of lobar volume loss and ground-glass opacification and prominence of central vessels on HRCT were quantitatively assessed. Pulmonary function was assessed by measurements of lung volumes, spirometry, gas transfer and oxygen saturation. ETCO levels were measured using an end-tidal CO monitor. Forced expiratory volume in one second (FEV1), forced vital capacity and total lung capacity significantly correlated with HRCT findings, particularly lobar volume loss. ETCO levels significantly negatively correlated with FEV1, vital capacity measured using a plethysmograph, specific airway conductance and arterial oxygen saturation measured by pulse oxymetry. In conclusion, the present results suggest that high-resolution computed tomography noninvasive assessment of haemolysis might be useful to identify sickle cell disease patients with respiratory function impairment. 相似文献
74.
75.
76.
C Berg F Bender M Soukup A Geipel R Axt-Fliedner J Breuer U Herberg U Gembruch 《Ultrasound in obstetrics & gynecology》2006,28(7):882-889
OBJECTIVE: To evaluate the prenatal distribution, associated conditions and outcome of the different types of right aortic arch (RAA) detected in fetal life. METHODS: This was a retrospective review of all cases of RAA detected prenatally between 1998 and 2005 in two tertiary referral centers. RESULTS: In the study period 71 cases of RAA were detected; 26 (37%) had RAA with aberrant left subclavian artery, 23 (32%) had RAA with mirror-image branching, 20 (28%) had RAA of unknown type and two (3%) had double aortic arch. While 20/26 cases with RAA and aberrant left subclavian artery were isolated findings, all 23 cases with RAA and mirror-image branching were associated with cardiac defects, namely tetralogy of Fallot (43%) or pulmonary atresia with ventricular septal defect (22%). Of the 20 cases with RAA, 19 of unknown type were associated with heterotaxy syndromes and had additional cardiac malformations and ambiguities of the situs. The two cases with DAA were isolated findings. Seven cases in our series (10%) had a microdeletion 22q11 and these were significantly associated with extracardiac malformations. The outcome in our series depended solely on the associated cardiac and extracardiac malformations, with the exception of one infant with isolated DAA, in whom a surgical correction was warranted. CONCLUSIONS: RAA detected in fetal life is associated frequently with other cardiac/non-cardiac malformations, heterotaxy syndromes and microdeletions 22q11. The associated conditions vary depending on the branching type of the brachiocephalic vessels and the presence of extracardiac malformations. 相似文献
77.
78.
At the moment, therapeutic splitting is still regarded by the vast majority of surgeons as the gold standard for stones in the common bile duct. Endoscopic clearance of the duct certainly is much less invasive than open exploration. However, this does not apply when compared with laparoscopic stone removal. Both are equivalent in respect to stone clearance rates, but the laparoscopic techniques protect patients from the long-term sequelae of endoscopic papillotomy. This can be important particularly for younger patients. Laparoscopic bile duct exploration is cost-effective and safe. Special experience in laparoscopic surgical techniques, however, is mandatory. Thus, surgeons should intensify their training in laparoscopic bile duct exploration in order to increase the acceptance of these techniques. 相似文献
79.
The influence of short‐term confinement and moderate exercise on tibia development was investigated in growing pigs (36–41 kg, 10 weeks at the beginning of the study). Animals were kept for 2 weeks either in individual crates of 0.8 m2 (‘confinement’, n = 4) or kept in groups of four animals in large crates of 5.6 m2 without (‘control’) or with additional exercise (30 min walking at 5 days/week; ‘exercise’). Bone density and morphological parameters were evaluated by computer tomography (CT). Periosteal apposition and longitudinal growth were determined after polychrome sequential labelling in weekly intervals. Cortical areas of the cross sections at the mid‐shaft and at 75% of the length of the bone measured distal to the carpus by CT were significantly correlated to each other (r = 0.70) and revealed a significant reduction in confined animals. This difference was explained by lower periosteal apposition rates in these animals compared with exercised and group‐housed pigs. Similarly longitudinal growth and the formation and calcification of spongiosa of the tibiae were inhibited by confinement. Thus, 2 weeks of confinement led to significant differences in bone growth and metabolism in young growing piglets when compared with animals with moderate activity. 相似文献
80.
Joe Jacob Shibhu George B. R. Suchit Roy P. U. Rajesh 《Indian journal of otolaryngology and head and neck surgery》2006,58(1):76-77
Malignancy larynx usually presents early, the common symptoms being hoarseness, pain thorat, cough and irritation of throat. An advanced malignancy is likely to be complicated by a pharyngo-cutaneous fistula. However it is an occurrence towards the end stage of the disease. Here we present a case of malignancy larynx primarily presenting as pharyngo-cutaneous fistula without any other symptoms. 相似文献