Does a prediction model for pregnancy of unknown location developed in the UK validate on a US population?
Barnhart KT, Sammel MD, Appleby D, Rausch M, Molinaro T, Van Calster B, Kirk E, Condous G, Van Huffel S, Timmerman D, Bourne T. Does a prediction model for pregnancy of unknown location developed in the UK validate on a US population? Hum Reprod. 2010 Oct; 25(10):2434-40.