Urban-rural differences in questionnaire-derived markers of asthma in Kenyan school children
JA Odhiambo, LW Ng'ang'a, MW Mungai, CM Gicheha, JK Nyamwaya, F Karimi, PT Macklem, MR Becklake
European Respiratory Journal 1998 12: 1105-1112; DOI: 10.1183/09031936.98.12051105