1. Secondary thrombocytosis;Vora, A.J.; Lilleyman, J.S.;Arch Dis Child,1993
2. and increased thrombopoietin;Nickerson, H.J.; Silberman, T.L.; Hepatoblastoma, McDonald T.P.; thrombocytosis;Cancer,1990
3. Cycle helmets;Rogers, M.;Arch Dis Child,1993
4. Helmets for pedal cyclists;Trippe, H.R.;BMJ,1992
5. Do cycle helmets prevent serious head injury? Cycling without helmets;McCarthy, M.;BMJ,1992