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Population Forecast Research Methodology Forecasting Psychosocial Factors India population economics demography Southern Asia developing country Population Dynamics Developing Countries statistics Asia Western Asia Asia, Western Demographic Analysis Occupations psychology Manpower Needs health care manpower occupation Health Manpower Psychological Factors Behavior Africa Northern Africa Article Africa, Northern migration international migration Demographic Factors research Estimation Technics Emigration and Immigration Economic Factors Human Resources employment Labor Force