Kiper POS, Saito H, Gori F, Unger S, Hesse E, Yamana K, Kiviranta R, Solban N, Liu J, Brommage R, Boduroglu K, Bonaf? L, Campos-Xavier B, Dikoglu E, Eastell R, Gossiel F, Harshman K, Nishimura G, Girisha KM, Stevenson BJ, Takita H, Rivolta C, Superti-Furga A, Baron R. Cortical-Bone Fragility--Insights from sFRP4 Deficiency in Pyle's Disease. N Engl J Med. 2016 Jun 30; 374(26):2553-2562.