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AIM To determine the relationship between accommodative amplitude and central lens thickness/equatorial lens diameter (CLT/ELD) ratio in vertebrates. METHODS Midsagittal sections of lenses from fixed, post mortem eyes from 125 different vertebrate species were photographed. Their CLT/ELD ratios were correlated with independently published measurements of(More)
BACKGROUND This study evaluated the efficacy and the complications associated with the use of the covered Wallstent in the setting of unresectable malignant biliary obstruction. METHODS Between March 2001 and January 2003, all patients with distal malignant biliary obstruction that required drainage were treated with a covered Wallstent. Every 2 months,(More)
BACKGROUND The self-expandable metallic stent is increasingly being used for management of malignant biliary strictures. In certain clinical situations, it also may be an alternative treatment for benign strictures. The ability to remove a metallic stent would be advantageous to the management of many biliary strictures, regardless of etiology. METHODS(More)
BACKGROUND CONTEXT Spinal cord herniation is a rare but well-documented condition that has been associated with tethering through the dural defect. Both spinal cord herniation and cord tethering result in progressive myelopathy that can be improved or stabilized with surgical intervention. Most cases of herniation are caused by dural defects in the ventral(More)
Technology empowers students but can also entice them to plagiarise. To tackle this problem, plagiarism detection tools are especially useful, not only in popular thinking as a deterrent for students, but also as an educational tool to raise students' awareness of the offence and to improve their academic skills. Commercial text matching tools (e.g.(More)
BACKGROUND Endoscopy (esophagogastroduodenoscopy, EGD) to screen for esophageal varices (EV) is recommended in patients with portal hypertension. Reports indicate that capsule endoscopy (CE) is capable of identifying large/medium varices (L/MV) when the varix comprises more than 25% of the circumference of the field of view. AIMS We evaluated the ability(More)
Sebé and Domingo-Ferrer proposed in a recent Letter a fingerprinting scheme that exploits the properties of dual binary Hamming codes to reduce the length of fingerprints. The authors show that this scheme is subject to an attack in which a collusion of (any) three buyers can frame an innocent buyer. Introduction: Piracy of digital assets, and in particular(More)
[reaction: see text] The cross metathesis reactivities of alpha-methylene-gamma-butyrolactone and an alpha-methylene-delta-lactone have been investigated. alpha-Methylene-gamma-butyrolactone undergoes rapid and efficient olefin isomerization in the presence of second-generation metathesis catalysts. However, cross metathesis can be achieved with the(More)