HSCT	Hematopoietic Stem Cell Transplantation
aGVHD	Acute Graft-versus-Host Disease
cGVHD	Chronic Graft-versus-Host Disease
GVHD	Graft-versus-Host Disease
APC	Antigen-Presenting Cell
Treg	Regulatory T cells
Th1	T helper 1 cells
Th2	T helper 2 cells
Th17	T helper 17 cells
NK	Natural Killer cells
CMV	Cytomegalovirus
HLA	Human Leukocyte Antigen
25(OH)D	25-Hydroxyvitamin D
1,25(OH)2D	1,25-Dihydroxyvitamin D
VDR	Vitamin D Receptor
CYP27B1	1-alpha-hydroxylase
DEXA	Dual-Energy X-ray Absorptiometry
BMI	Body Mass Index
AML	Acute Myeloid Leukemia
ALL	Acute Lymphoblastic Leukemia
IU	International Units
GI-GVHD	Gastrointestinal Graft-versus-Host Disease
LC-MS/MS	Liquid Chromatography–Tandem Mass Spectrometry
CPOE	Computerized Provider Order Entry
LL-37	Cathelicidin Antimicrobial Peptide
OS	Overall Survival
DFS	Disease-Free Survival