1. Pediatric oncology in developing countries: A cooperative program in Nicaragua;Masera;Ann Oncol,1993
2. North-South Asymmetry;Tognoni;Ann Oncol,1993
3. Improving cancer care worldwide;Tobias;Ann Oncol,1993
4. ban on tobacco advertisement;Ann Oncol,1991
5. difficulties for oncology in developing countries;Ann Oncol,1991