Severe secondary hyperparathyroidism in patients on haemodialysis is associated with a high initial serum parathyroid hormone and beta-CrossLaps level: Results from an incident coh... oleh Guillaume Jean, Marie Hélène Lafage-Proust, Jean Claude Souberbielle, Sylvain Lechevallier, Patrik Deleaval, Christie Lorriaux, Jean Marc Hurot, Brice Mayor, Manolie Mehdi, Charles Chazot