RT Journal Article SR Electronic T1 A black femoral head JF BMJ Case Reports FD BMJ Publishing Group Ltd SP bcr0820080607 DO 10.1136/bcr.08.2008.0607 VO 2009 A1 Enrico Selvi A1 Roberta Maggio A1 Estrella Garcia Gonzalez A1 Marco Bardelli YR 2009 UL http://casereports.bmj.com/content/2009/bcr.08.2008.0607.abstract AB