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2. Factors affecting the occurrence of acute otitis media during the first year of life;Kero, P.; Piekkala, P.;Acta Paediatr Scand,1987
3. Risk factors for recurrent acute otitis media and respiratory infection in infancy;Alho, O.-P.; Koivo, M.; Sorri, M.; Rantakallio, P.;IntJ Pediatr Otorhinolaryngol,1990
4. Risk factors affecting the occurrence of acute otitis media among 2-3-year old urban children;Pukander, J.; Luotonen, J.; Timonen, M.; Karma, P.;Acta Otolaryngol (Stockh),1985
5. Prolonged breast feeding as prophylaxis for recurrent otitis media;M, Saarinen U.;Acta Pediatr Scand,1982