title: The winds of change.
authors.forename: M
authors.initials: M
authors.lastname: Castillo
references.citation: BMJ. 2008 Apr 5;336(7647):749
references.pmid: 18390525
references.citation: AJR Am J Roentgenol. 2007 Apr;188(4):897-900
references.pmid: 17377020
references.citation: JAMA. 2009 Feb 25;301(8):863-4
references.pmid: 19244195
references.citation: Maturitas. 2011 Mar;68(3):264-7
references.pmid: 21030166
references.citation: BMJ. 2008 Apr 5;336(7647):748
references.pmid: 18390524