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OBJECTIVE To estimate the occurrence and school-level clustering of drug involvement among school-attending adolescent youths in each of seven countries in Latin America, drawing upon evidence from the PACARDO research project, a multinational collaborative epidemiological research study. METHODS During 1999-2000, anonymous self-administered(More)
A pervasive mobile computing environment is typically composed of multiple fixed and mobile entities that interact autonomously with each other with very little central control. Many of these interactions may occur between entities that have not interacted with each other previously. Conventional security models are inadequate for regulating access to data(More)
The enzyme 5alpha-reductase is responsible for the conversion of testosterone (T) to its more potent androgen dihydrotestosterone (DHT). This steroid had been implicated in androgen-dependent diseases such as: benign prostatic hyperplasia, prostate cancer, acne and androgenic alopecia. The inhibition of 5alpha-reductase enzyme offers a potentially useful(More)
INTRODUCTION Brake linings and brake pads are among the asbestos-containing products that are readily available in Colombia. When sold separated from their support, brake linings require extensive manipulation involving several steps that include drilling, countersinking, riveting, bonding, cutting, beveling, and grinding. Without this manipulation, brake(More)
Mauritia flexuosa is a keystone species with a broad geographic distribution throughout the Amazon. Environmental changes can impact the reproductive success in a keystone species such as M. flexuosa, which results in a cascade of events that impacts many other species. The present study examined the reproductive phenology in the palm M. flexuosa between(More)
Introduction: Psychometric data concerning structured clinical interviews are affected by age and population characteristics. The present study was designed to investigate the test-re-test interrater reliability of a Spanish version of the Structured Clinical Interview for Major Depressive Disorder (MDD) in adolescent students from Colombia. Methods: All(More)
Due to both the number of entities and the nature of the interactions and collaborations amongst them, conventional security models are inadequate for regulating access to data and services in a pervasive mobile computing environment. Since many of these interactions occur between entities that have not interacted with each other previously, new security(More)
In this study, the authors probed the latent structure of the adolescent behavioral repertoire (ABR) and estimated its sociodemographic correlates. The authors drew a nationally representative sample of 12,797 school-attending youth from the 7 countries in the PACARDO region of Latin America: Panama, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica,(More)