Despite the central role of self-assembled groups in animal and human societies, statistical tools to explain their composition are limited. The authors introduce a framework for cross-sectional observations with exclusive membership illuminate social organizational mechanisms that bring people together. Drawing from stochastic models networks partitions, proposed introduces an exponential fami...

background nephrolithiasis is a widespread multifactorial disorder. constitutional, environmental and genetic factors play a role in stone formation. although important advances have been made in understanding the pathophysiology of stone formation, none of the many theories have given a satisfactory explanation of this process. objectives the objective of study was to evaluate the probable rel...