QUESTION UNDER STUDY The study has following objectives: 1) to determine the incidence of higher-order multiple births from 2005 to 2008 in Switzerland and its evolution over the last twenty years, and 2) to analyse the neonatal outcome and its change over the last two decades. METHODS Data on higher-order multiple births were retrospectively obtained from Swiss obstetric and neonatal hospita...

Phenomenological implications of the Z ′ in SU(3)×SU(3)×U(1) extension of the standard model are studied. The model improves the fit for Rb as well as the high ET jet cross section observed by CDF. 1. Model: We consider the SU(3)color×SU(3)×U(1) extension of the standard model, proposed earlier by Frampton [1] to determine its predictions for the observables that appear to show deviation from s...

OBJECTIVE To examine trends in multiple births conceived using assisted reproductive technology (ART) in the United States between 1997 and 2000 and to estimate the proportion of all US multiple births attributable to ART use. METHODS We analyzed population-based data of 109 519 live-born infants who were conceived in the United States using ART and born between 1997 and 2000 and population-b...