A rare cause of hypercalcemia: Congenital Lactase Deficiency - Eltan, Mehmet; Alavanda, Ceren; Abali, Saygin; Abali, Zehra Yavas; Kaygusuz, Sare Betul; Tosun, Busra Gurpinar; Menevse, Tuba Seven; Helvacioglu, Didem; Guran, Tulay; Ata, Pinar; Bereket, Abdullah; Turan, Serap (KARGER, 2021)