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APA Citation
El-Metwally, A., Halder, S., Thompson, D., Macfarlane, G. J., & Jones, G. T. (2007). predictors of abdominal pain in schoolchildren: a 4-year population-based prospective study. Archives of disease in childhood, 92(12), 1094–1098. http://access.bl.uk/ark:/81055/vdc_100135147264.0x000049