{Reference Type}: Letter {Title}: Guidelines on the use of prophylactic factor replacement for children and adults with Haemophilia A and B. {Author}: Rayment R;Chalmers E;Forsyth K;Gooding R;Kelly AM;Shapiro S;Talks K;Tunstall O;Biss T; ; {Journal}: Br J Haematol {Volume}: 190 {Issue}: 5 {Year}: 09 2020 {Factor}: 8.615 {DOI}: 10.1111/bjh.16704 {Abstract}: