全文获取类型
收费全文 | 1072篇 |
免费 | 90篇 |
国内免费 | 19篇 |
专业分类
儿科学 | 79篇 |
妇产科学 | 5篇 |
基础医学 | 130篇 |
口腔科学 | 63篇 |
临床医学 | 122篇 |
内科学 | 189篇 |
皮肤病学 | 46篇 |
神经病学 | 27篇 |
特种医学 | 246篇 |
外科学 | 82篇 |
综合类 | 29篇 |
预防医学 | 52篇 |
眼科学 | 13篇 |
药学 | 29篇 |
1篇 | |
肿瘤学 | 68篇 |
出版年
2021年 | 6篇 |
2020年 | 9篇 |
2019年 | 8篇 |
2018年 | 15篇 |
2017年 | 6篇 |
2016年 | 12篇 |
2015年 | 27篇 |
2014年 | 23篇 |
2013年 | 43篇 |
2012年 | 22篇 |
2011年 | 20篇 |
2010年 | 53篇 |
2009年 | 52篇 |
2008年 | 23篇 |
2007年 | 33篇 |
2006年 | 24篇 |
2005年 | 26篇 |
2004年 | 16篇 |
2003年 | 26篇 |
2002年 | 20篇 |
2001年 | 16篇 |
2000年 | 5篇 |
1999年 | 22篇 |
1998年 | 81篇 |
1997年 | 78篇 |
1996年 | 60篇 |
1995年 | 53篇 |
1994年 | 37篇 |
1993年 | 45篇 |
1992年 | 7篇 |
1991年 | 23篇 |
1990年 | 15篇 |
1989年 | 42篇 |
1988年 | 35篇 |
1987年 | 25篇 |
1986年 | 18篇 |
1985年 | 18篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1982年 | 14篇 |
1981年 | 14篇 |
1980年 | 15篇 |
1978年 | 13篇 |
1977年 | 11篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1971年 | 3篇 |
1969年 | 6篇 |
1968年 | 3篇 |
1966年 | 3篇 |
排序方式: 共有1181条查询结果,搜索用时 15 毫秒
81.
Lothar AJ Heinemann Farid Saad Thomas Zimmermann Annoesjka Novak Eric Myon Xavier Badia Peter Potthoff Guy T'sjoen Pasi Pöllänen Nikolai P Goncharow Sehyun Kim Christelle Giroudet 《Health and quality of life outcomes》2003,1(1):1-5
Background
The interest of clinical research in aging males increased in recent years and thereby the interest to measure health-related quality of life (HRQoL) and symptoms of aging men. The Aging Males' Symptoms scale (AMS) became the most commonly used scale to measure HRQoL and symptoms in aging males in many countries worldwide. The aim of this paper is to review the current state of the instrument particularly concerning versions of the scale in different languages in the light of the quality of the translation process.AMS versions available
Most of the translations were performed following international methodological recommendations for linguistic & cultural adaptation of HRQoL instruments. Mainly the English version was used as source language for the translation into Dutch, Spanish, Portuguese, Italian, Swedish, and Japanese (attached as additional PDF-files). Preliminary versions that were derived only from forward translations are of secondary quality and available in Finnish, Flemish, and Russian. It is recommended to complete the translation process for the latter languages before using them in international studies.Translations in process
The AMS scale is in the process of consensus finding of two existing French versions, and the versions in the Korean, Thai, and Indonesian languages have not yet been completed in the translation process.Conclusion
The AMS scale is obviously a valuable tool for assessing health related quality of life in aging men, because it is used worldwide. It is a standardized scale according to psychometric norms. Most of the currently available language versions were translated following international standards for linguistic and cultural translation of quality of life scales. Assistance is offered to help interested parties in the translation process. 相似文献82.
Marleen?J?NahuisEmail author Nienke?S?Weiss Fulco?van der Veen Ben?Willem?J?Mol Peter?G?Hompes Jur?Oosterhuis Nils?B?Lambalk Jesper?MJ?Smeenk Carolien?AM?Koks Ron?JT?van Golde Joop?SE?Laven Ben?J?Cohlen Kathrin?Fleischer Angelique?J?Goverde Marie?H?Gerards Nicole?F?Klijn Lizka?CM?Nekrui Ilse?AJ?van Rooij Diederik?A?Hoozemans Madelon?van Wely 《BMC women's health》2013,13(1):42
Background
Clomiphene citrate (CC) is first line treatment in women with World Health Organization (WHO) type II anovulation and polycystic ovary syndrome (PCOS). Whereas 60% to 85% of these women will ovulate on CC, only about one half will have conceived after six cycles. If women do not conceive, treatment can be continued with gonadotropins or intra-uterine insemination (IUI). At present, it is unclear for how many cycles ovulation induction with CC should be repeated, and when to switch to ovulation induction with gonadotropins and/or IUI.Methods/Design
We started a multicenter randomised controlled trial in the Netherlands comparing six cycles of CC plus intercourse or six cycles of gonadotrophins plus intercourse or six cycles of CC plus IUI or six cycles of gonadotrophins plus IUI.Women with WHO type II anovulation who ovulate but did not conceive after six ovulatory cycles of CC with a maximum of 150 mg daily for five days will be included.Our primary outcome is birth of a healthy child resulting from a pregnancy that was established in the first eight months after randomisation. Secondary outcomes are clinical pregnancy, miscarriage, multiple pregnancy and treatment costs. The analysis will be performed according to the intention to treat principle. Two comparisons will be made, one in which CC is compared to gonadotrophins and one in which the addition of IUI is compared to ovulation induction only. Assuming a live birth rate of 40% after CC, 55% after addition of IUI and 55% after ovulation induction with gonadotrophins, with an alpha of 5% and a power of 80%, we need to recruit 200 women per arm (800 women in total).An independent Data and Safety Monitoring Committee has criticized the data of the first 150 women and concluded that a sample size re-estimation should be performed after including 320 patients (i.e. 80 per arm).Discussion
The trial will provide evidence on the most effective, safest and most cost effective treatment in women with WHO type II anovulation who do not conceive after six ovulatory cycles with CC with a maximum of 150 mg daily for five days. This evidence could imply the need for changing our guidelines, which may cause a shift in large practice variation to evidence based primary treatment for these women.Trial registration number
Netherlands Trial register NTR144983.
84.
AJ Phillips 《Clinical & experimental optometry》1989,72(2):32-34
A patient with severe ocular albinism was fitted with a prosthetic soft contact lens which improved both photophobic symptoms and facial cosmesis. 相似文献
85.
86.
87.
Anxiety in patients undergoing MR imaging 总被引:6,自引:0,他引:6
To determine and quantify the major sources of anxiety for patients undergoing magnetic resonance (MR) imaging and to suggest means by which to eliminate or diminish their negative effects, the authors studied anxiety in 46 subjects. Of these, 20 randomly selected subjects who successfully completed the examination participated in exit interviews. Six subjects who terminated the examination before completion also completed exit interviews. Pre-imaging and postimaging questionnaires (state-trait anxiety inventory) were administered to measure anxiety in the 20 other subjects. Anxiety was associated with the constrictive dimensions of the magnet bore, examination duration, coil noise, and temperature within the bore. Preparation at the point of referral was consistently absent, incomplete, or misleading. Patients used identifiable strategies to cope with the examination: blinding, breathing relaxation techniques, visualization of pleasant images, and performance of mental exercises. 相似文献
88.
Di Chiro G; Girton ME; Frank JA; Dietz MJ; Gansow OA; Wright DC; Dwyer AJ 《Radiology》1986,160(1):221-222
Canine cerebrospinal fluid rhinorrhea, which occurs frequently in purebred beagles, was demonstrated in two dogs on magnetic resonance images after cisternal introduction of gadolinium-DTPA dimeglumine. 相似文献
89.
STEWART AJ; ALLEN JD; ADGEY AAJ 《QJM : monthly journal of the Association of Physicians》1992,85(1):761-769
SUMMARY In 56 patients, frequency analysis of the electrocardiogramof ventricular fibrillation exhibited power spectra with a distinctdominant frequency. The greatest success for resuscitation fromventricular fibrillation is recorded when ventricular fibrillationdevelops after the patient comes under coronary care. Of the41 patients in whom the onset and first 8 s of ventricular fibrillationwere artefact-free the mean dominant frequency of primary ventricularfibrillation (no cardiogenic shock or cardiac failure) in 21patients was 6.2±0.2 Hz, significantly higher than themean dominant frequency of the first 8 s of secondary ventricularfibrillation (cardiogenic shock or heart failure) (4.0±0.2Hz, 20 patients, p =0.0001). In these patients the peak-to-troughamplitude (ECG) of the first 8 s of ventricular fibrillationwas similar in both primary and secondary ventricular fibrillationas was the mean duration of ventricular fibrillation prior tothe first DC shock. There was a significantly lower successrate for resuscitation from secondary ventricular fibrillation(6 of 20 patients) compared with resuscitation from primaryventricular fibrillation (18 of 21 patients, x2 17.8, p=0.001).Of the remaining 15 patients who were collapsed between 3 and20 min before the arrival of the mobile coronary care unit,the dominant frequency of the first 8 s of ventricular fibrillationfell with increased duration of collapse (from 5.5 Hz at 3 minto a mean of 2.1 Hz at 20 min). Four of these 15 patients whosurvived the initial arrest had a mean dominant frequency of5.2±0.3 Hz, which was significantly higher than the meandominant frequency (3.1±0.3 Hz, p<0.01) of the 11patients who were not resuscitated. This study shows that low frequency ventricular fibrillationis indicative of a poor chance of successful resuscitation.Alteration of the frequency may increase resuscitation success. 相似文献
90.