Frequency and age at occurrence of clinical manifestations of disease in patients with hypophosphatasia: a systematic literature review. - Szabo, Shelagh M.; Tomazos, Ioannis C.; Petryk, Anna; Powell, Lauren C.; Donato, Bonnie M. K.; Zarate, Yuri A.; Tiulpakov, Anatoly; Martos-Moreno, Gabriel Ángel (Orphanet Journal of Rare Diseases, 2019)