Dear friends: Recently I know this net of information and discussion that is excellent. I want to share with you the program of internal Control of quality and other programs given kindly by the Dr. Philippe Marquis,Biólogist of the Hospital Metz in France. http://perso.easynet.fr/~philimar Thank you for the teachings of the group. Elda Restrepo Bioreference Laboratory Bogotá Colombia. S.A