Introduction: Mental retardation is one of the most important problems of general health. The purpose of this study was to evaluate inheritance pattern of mentally retarded patients in Yazd city. Methods: In a descriptive cross- sectional study, all medical records and pedigrees of 320 mentally retarded children whose parents had referred for genetic consultation to the Welfare center of Yazd ...

Introduction: The assignment-based approach is an educational strategy that emphasizes learning by doing tasks. In this approach, the learner learns how to act in different situations, and this approach teaches skills that are similar to the tasks that the learner encounters in the real world and in practice. Therefore, the purpose of this study was to design an optimal assignment-based curricu...

The existing trade models suggest that for tradable goods potential partners can be many, but eventually only one (the one offering the best price) should be selected, therefore relatively few (unidirectional) trade links will appear between countries. If the structure of international trade flows describes as a network, trade link would give rise between countries. This paper exploit recently-...