Labor (2) International trade (2) Estudio (2) Trabajo (2) Comercio exterior (2) douane (2) Singapour (1) Data envelopment analysis (1) Employees (1) Vision (1) Trust (1) Time (1) Taxation (1) Stocks (1) Research (1) Quality of products (1) Public administration (1) Perception (1) Evaluation (1) Error (1) Equations (1) Empathy (1) Customs administration (1) Creative ability (1) Confidence (1) Commerce (1) Chemical elements (1) Boundaries (1) Automated external defibrillation (1) Desfibrilación externa automática (1)