willingness-to-pay discrete choice analysis 2 willingness to pay 2 Adolescent 1 Adult 1 Agricultural risk management 1 Article 1 COVID-19 Vaccines 1 Counterfactual simulations 1 Covid-19 1 Cross-Sectional Studies 1 Female 1 Health Care Costs 1 Health Expenditures 1 Humans 1 Immunization 1 India 1 Male 1 Middle Aged 1 Patients 1 SARS-CoV-2 vaccine 1 Viet Nam 1 Vietnam 1 Willingness To Pay 1 acceptance 1 adolescent 1 adult 1 agricultural management 1 agricultural worker 1 civil servant 1