http://www.wfh.org/en/page.aspx?pid=637#Difference_A_B http://www.wfh.org/en/page.aspx?pid=637#Difference_A_B. http://www.wfh.org/en/page.aspx?pid=637#Difference_A_B. World Federation of Hemophilia https://www.wfh.org/en/sslpage.aspx?pid=637 http://www.wfh.org/en/page.aspx?pid=637#Difference_A_B. http://www.wfh.org/en/page.aspx?pid=637#Difference_A_B