volume 120 | number 5 | May 2012 • Environmental Health Perspectives Stephen M. Levin died as a result of cancer on 7 February 2012. He was born to Sam and Sarah Levin of Philadelphia, Pennsylvania, on 16 October 1941. He graduated from Wesleyan University in 1963 and earned his medical degree from New York University School of Medicine in 1967. After completing a surgery internship and a psych...

In 1984, Leonid Levin initiated a theory of average-case complexity. We provide an exposition of the basic definitions suggested by Levin, and discuss some of the considerations underlying these definitions.

Diurnal EEGs of a 17 year old male with the Kleine-Levin syndrome revealed moderate diffuse abnormalities and stage REM at sleep onset during attacks. Overnight, stages 3, 4, and REM of sleep were decreased, but sleep onset REM stage was not seen. These records returned to normal between attacks.

Institute for Health Metrics and Evaluation, University of Washington, Seattle, WA, USA (M Ng PhD, E Gakidou PhD, A Levin-Rector MPH, Prof C J L Murray DPhil, Prof L Dandona MD); Faculty of Education, University of Hong Kong, Hong Kong (M Ng); Ministry of Health and Family Welfare, Government of India, New Delhi, India (A Khera MD); and Public Health Foundation of India, New Delhi, India (Prof ...

Legend: O-CTR= open carpal tunnel release, E-CTR= endoscopic carpal tunnel release, CSA= cross sectional area, MN-UA: distance between the median nerve and ulnar neurovascular bundle, US= ultrasound, SD=standard deviation, p values < 0.05 were considered as statistically significant and are highlighted with bold. Table 1. Overview of the data from the preoperative ultrasound evaluation of the p...