John O. Gyapong

The political origins of health inequity: prospects for change

Michael Marmot, Ole Petter Ottersen, Sakiko Fukuda-Parr, 2014, The Lancet.

Vitamin A supplementation in northern Ghana: effects on clinic attendances, hospital admissions, and child mortality

B. Kirkwood, P. Smith, S. Morris, 1993, The Lancet.

Impact of vitamin A supplementation on childhood morbidity in northern Ghana

B. Kirkwood, S. Morris, P. Arthur, 1992, The Lancet.