Abbreviation	Definition
6MWD	Six-Minute Walk Distance
BMI	Body Mass Index
CAT	COPD Assessment Test
COPD	Chronic Obstructive Pulmonary Disease
DNA	Deoxyribonucleic Acid
FEV1	Forced Expiratory Volume in One Second
FKBP5	FK506 Binding Protein 5
GOLD	Global Initiative for Chronic Obstructive Lung Disease
ICF	International Classification of Functioning, Disability and Health
IL-6	Interleukin-6
LMR	Lymphocyte-to-Monocyte Ratio
MRC	Medical Research Council Dyspnoea Scale
NIH	National Institutes of Health
NLR	Neutrophil-to-Lymphocyte Ratio
OR	Odds Ratio
PLR	Platelet-to-Lymphocyte Ratio
REDCap	Research Electronic Data Capture
SGRQ	St George’s Respiratory Questionnaire
SII	Systemic Immune–Inflammation Index
SIRI	Systemic Inflammation Response Index
Treg	Regulatory T Cell
TTV	Torque Teno Virus
VZV	Varicella-Zoster Virus
WHO	World Health Organization
α7nAChR	Alpha-7 Nicotinic Acetylcholine Receptor