全文获取类型
收费全文 | 21098篇 |
免费 | 1262篇 |
国内免费 | 64篇 |
专业分类
耳鼻咽喉 | 332篇 |
儿科学 | 1145篇 |
妇产科学 | 508篇 |
基础医学 | 1864篇 |
口腔科学 | 384篇 |
临床医学 | 1648篇 |
内科学 | 5010篇 |
皮肤病学 | 343篇 |
神经病学 | 1045篇 |
特种医学 | 865篇 |
外国民族医学 | 1篇 |
外科学 | 3722篇 |
综合类 | 501篇 |
一般理论 | 3篇 |
预防医学 | 1123篇 |
眼科学 | 909篇 |
药学 | 1567篇 |
1篇 | |
中国医学 | 75篇 |
肿瘤学 | 1378篇 |
出版年
2023年 | 165篇 |
2022年 | 345篇 |
2021年 | 766篇 |
2020年 | 408篇 |
2019年 | 609篇 |
2018年 | 716篇 |
2017年 | 499篇 |
2016年 | 510篇 |
2015年 | 514篇 |
2014年 | 801篇 |
2013年 | 1019篇 |
2012年 | 1511篇 |
2011年 | 1365篇 |
2010年 | 890篇 |
2009年 | 707篇 |
2008年 | 1020篇 |
2007年 | 1035篇 |
2006年 | 951篇 |
2005年 | 887篇 |
2004年 | 793篇 |
2003年 | 676篇 |
2002年 | 602篇 |
2001年 | 484篇 |
2000年 | 515篇 |
1999年 | 410篇 |
1998年 | 195篇 |
1997年 | 171篇 |
1996年 | 151篇 |
1995年 | 151篇 |
1994年 | 127篇 |
1993年 | 102篇 |
1992年 | 283篇 |
1991年 | 254篇 |
1990年 | 226篇 |
1989年 | 226篇 |
1988年 | 186篇 |
1987年 | 186篇 |
1986年 | 168篇 |
1985年 | 177篇 |
1984年 | 159篇 |
1983年 | 155篇 |
1982年 | 77篇 |
1981年 | 88篇 |
1980年 | 76篇 |
1979年 | 120篇 |
1978年 | 94篇 |
1974年 | 75篇 |
1973年 | 110篇 |
1972年 | 100篇 |
1971年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
83.
We reviewed the records of 104 patients with Stage T1NO or Stage T2NO epidermoid carcinoma of the supraglottic larynx treated between 1965 and 1979. In 79 patients, surgery was the only type of initial treatment. These 79 patients are the subjects of this report. Forty-eight (61%) of these patients were treated by total laryngectomy, whereas 31 (39%) had a partial laryngectomy. An elective unilateral radical neck dissection was performed on 31 patients considered at high risk, but metastatic disease was found in the dissected side of the neck histologically in only 32% (ten of 31) of these patients. The minimum follow-up period was 5 years and the maximum was 20 years. Twenty-nine percent of the patients (23 of 79) experienced a neck relapse. The neck relapse rate was the same whether the patients did or did not have an elective radical neck dissection. Among the patients who experienced a neck relapse, 65% (15 of 32) have died of the cancer. Among those who did not experience a neck relapse, none (zero of 56) have died of the cancer (P less than 0.01). These results indicate that in surgically treated patients with early stage supraglottic larynx cancer, neck relapse was the major cause of failure associated with death from cancer. Strategies for decreasing the relapse rate are discussed. 相似文献
84.
Nishit J. Shah Mukul Navnit Chandrashekhar E. Deopujari Shraddha S. Mukerji 《Indian journal of otolaryngology and head and neck surgery》2004,56(1):71-78
Endonasal endoscopic surgery is now the preferred technique to tackle pituitary tumours. Our paper describes the stepwise
endoscopic approach for surgeons embarking on pituitary surgery. It also highlights the common pitfalls encountered during
surgery and the ways to avoid them. One must proceed in a gradual step- wise manner starting from simple exposure of the sphenoid
sinus to complete endoscopic tumour removal so us to gain the neurosurgeon’s confidence as well as develop our own skills,
confidence and ability to tackle complications. We use the endonasal paraseptal trans- sphenoidal approach. Surgery begins
with gentle packing between the middle turbinate and septum to expose the anterior sphenoid wall and expose the sphenoid astium.
The ostitum is then widened inferiorly and onto the opposite side to expose both sphenoid sinuses. The inter- sphenoid sinus
and necessary mucosa is removed to expose the sella. We then use a bone flap technique or punches to open the sella. After
incising the dura, tumour is removed with a suction curette. An endoscope holder facilitates the operation. The bone flap
is replaced at the end of surgery to reconstruct the sella. This is especially important if a CSF leak is present. Nasal packing
is usually not required. 相似文献
85.
INTRODUCTION: Controversy around sub-specialisation in a district general hospital (DGH) has been ongoing for years. AIM: To study the effect of colorectal sub-specialisation on general surgical cases. METHODS: A retrospective audit between October 2002 and September 2003, including all referrals to the outpatient clinics of a single consultant surgeon in a DGH. RESULTS: 1,055 patients were seen in outpatient clinics, of which 53% (563) were seen in rapid access colorectal clinics. Overall, 87% (914) of patients were diagnosed to have colorectal pathology. The majority of the colorectal cases were referred using the designated referral forms. There were 427 urgent, 162 soon and 325 routine referrals with colorectal pathology, and 35 urgent, 22 soon and 84 routine referrals with non-colorectal pathology. Median waiting times for urgent, soon and routine referrals were 12, 61 and 91 days, respectively, for patients with colorectal pathology, in comparison with 44, 75 and 397 days for non-colorectal pathology. CONCLUSION: This audit confirms that colorectal sub-specialisation has resulted in a significant delay in the management of patients with non-colorectal diseases. This has major implications within a DGH setting. 相似文献
86.
Yang-Sheng Tzeng Eric Hoffman Janice Cook-Granroth Rie Maurer Niral Shah Joey Mansour Juerg Tschirren Mitchell Albert 《Magnetic resonance in medicine》2007,58(3):636-642
An anthropomorphic airway tree phantom was imaged with both hyperpolarized (HP) 3He MRI using a dynamic projection scan and computed tomography (CT). Airway diameter measurements from the HP 3He MR images obtained using a newly developed model-based algorithm were compared against their corresponding CT values quantified with a well-established method. Of the 45 airway segments that could be evaluated with CT, only 14 airway segments (31%) could be evaluated using HP 3He MRI. No airway segments smaller than approximately 4 mm in diameter and distal to the fourth generation were adequate for analysis in MRI. For the 14 airway segments measured, only two airway segments yielded a non-equivalent comparison between the two imaging modalities, while eight more had inconclusive comparison results, leaving only four airway segments (29%) that satisfied the designed equivalence criteria. Some of the potential problems in airway diameter quantification described in the formulation of the model-based algorithm were observed in this study. These results suggest that dynamic projection HP 3He MRI may have limited utility for measuring airway segment diameters, particularly those of the central airways. 相似文献
87.
88.
89.
90.