Hypercalcemia in langerhans’ cell granulomatosis with elevated 1,25 dihydroxyvitamin D (calcitriol) level - Al-Ali, H.; Yabis, A. Abou; Issa, E.; Salem, Z.; Tawil, A.; Khoury, N.; Fuleihan, G. El-Hajj (BONE (8756-3282), 2002)