selection bias Humans 3 human 3 Article 2 Selection Bias 2 adult 2 aged 2 female 2 male 2 Adolescent 1 Adult 1 Aged 1 Bayes Theorem 1 Bayes theorem 1 Bias 1 COVID-19 1 Chemoradiotherapy 1 Chemotherapy 1 Child 1 China 1 Clinical Competence 1 Commerce 1 Databases, Factual 1 Empirical examination 1 Entry mode 1 Farmer professional cooperatives 1 Female 1 Foreign investment 1 Go/No Go decision 1 Head and neck cancer 1