25(OH)D	25-hydroxyvitamin D
AD	Atopic Dermatitis
AMP	Antimicrobial Peptide
AV	Acne Vulgaris
BMI	Body Mass Index
CRP	C reactive Protein
CVD	Cardiovascular Disorder
DBP	Vitamin D Binding Protein
ELISA	Enzyme-Linked Immunosorbent Assay
FMF	Familial Mediterranean Fever
GWAS	Genome-Wide Association Study
HS	Hidradenitis Suppurativa
HS-PGA	Hidradenitis Suppurativa Physician Global Assessment
IBD	Inflammatory Bowel Disease
IFN	Interferon
IHS4	International Hidradenitis Suppurativa Severity Score System
IL	Interleukin
iPTH	Intact Parathyroid Hormone
IV	Instrumental Variable
IVW	Inverse-Variance Weighted
LD	Linkage Disequilibrium
MMAT	Mixed Methods Appraisal Tool
MR	Mendelian Randomization
PAPASH	Pyogenic Arthritis, Acne, Pyoderma gangrenosum, Suppurative Hidradenitis
PASH	Pyoderma gangrenosum, Acne, Suppurative Hidradenitis
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
PTH	Parathyroid Hormone
RA	Rheumatoid Arthritis
ROS	Reactive Oxygen Species
RXR	Retinoid X Receptor
SNP	Single Nucleotide Polymorphism
TLR	Toll-Like Receptor
TNF	Tumor Necrosis Factor
VDR	Vitamin D Receptor