Quality assurance 33 Quality control 19 Humans 12 human 12 Water quality 7 quality control 7 Water quality indexes 6 Article 5 Machine learning 5 article 5 controlled study 5 female 5 water quality 5 Quality Assurance (QA) & Total Quality Management (TQM) 4 adult 4 quality assurance 4 China 3 Decision making 3 Education 3 Female 3 Land use 3 Quality Assurance, Health Care 3 Regression analysis 3 River pollution 3 Rivers 3 Water quality index 3 Watersheds 3 male 3 procedures 3 river water 3