title: Factor IX deficiency (Christmas disease).
authors.affiliation: Associate Professor, Department of Transfusion Medicine, AFMC, Pune 40, India.
authors.forename: J
authors.initials: J
authors.lastname: Philip
authors.affiliation: Commandant, 151 Base Hospital, C/o 99 APO, India.
authors.forename: R S
authors.initials: RS
authors.lastname: Sarkar
authors.affiliation: Classified Specialist (Transfusion Medicine), INHS Asvini, Mumbai, India.
authors.forename: S
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Resident, Department of Transfusion Medicine, AFMC, Pune 40, India.
authors.forename: B R
authors.initials: BR
authors.lastname: Prathip
authors.affiliation: Resident, Department of Transfusion Medicine, AFMC, Pune 40, India.
authors.forename: Amardeep
authors.initials: A
authors.lastname: Pathak
keywords: Coagulation-profile; Factor IX; Hemophilia B