Serum Calcium, PTH, 25OHD, and 1,25(OH)D in Group 1 (PHP Alone) and Group 2 (PHP + Vitamin D Deficiency) Presurgery and Postsurgery, and in Group 2 After Vitamin D2 (Ergocalciferol) Supplementation Postsurgery. Here, PTH is linked to vitamin D deficiency.