Validity of an Instrumental Variable Fan Yang, José R. Zubizarreta, Dylan S. Small, Scott Lorch, Paul R. Rosenbaum1 University of Pennsylvania and Columbia University Abstract: An instrument or instrumental variable is often used in an effort to avoid selection bias in inference about the effects of treatments when treatment choice is based on thoughtful deliberation. An instrument is a haphaza...

Mycobacterium abscessus subsp abscessus is the most common respiratory pathogen among the rapidly growing non-tuberculous mycobacteria (NTM) and is also the most feared due to its well-deserved reputation for being refractory to antibiotic therapy. M. abscessus subsp abscessus has multiple innate antibiotic resistance mechanisms, but the most important one described so far is an inducible eryth...

The innate immune system is the first line of defense in response to nonself and danger signals from microbial invasion or tissue injury. It is increasingly recognized that each organ uses unique sets of cells and molecules that orchestrate regional innate immunity. The cells that execute the task of innate immunity are many and consist of not only "professional" immune cells but also nonimmune...

Narcissism is a multifaceted construct that is inconsistently defined and assessed between clinical psychology and social-personality psychology. The purpose of the present study was to examine the similarities and differences in the cognitive schemas underlying various forms of narcissism. This was accomplished by examining the associations of normal and pathological forms of narcissism with t...