This paper examines tourism competition among the Mediterranean countries with particular emphasis on Greece. The estimated model includes as explanatory variables an income index, a price index of the host country, a price index of the competitors (Spain, Portugal and Italy) and exchange rate. The results show that the main determinants of Greece's tourism demand are both price indexes and exchange rate. They also show that Spain seems to be Greece's main competitor.

Objective: Preterm labor is one of the most significant obstetric problems associated with high rate of actual and long-term perinatal complications. Despite the creation of scoring systems, uterine activity monitoring, cervical ultrasound and several biochemical markers, the prediction and prevention of preterm labor is still a matter of concern. The aim of this study was to examine cervical findings for the prediction and the comparative use of Arabin pessary or cerclage for the prevention of preterm birth in asymptomatic women with high risk factors for preterm labor. Material and methods: The study group was composed of singleton pregnancies (spontaneously conceived) with high risk factors for preterm labor. Cervical length, dilatation of the internal cervical os and funneling, were estimated with transvaginal ultrasound during the first and the second trimesters of pregnancy. Results: Cervical funneling, during the second trimester of pregnancy, was the most significant factor for the prediction of preterm labor. The use of Arabin cervical pessary was found to be more effective than cerclage in the prolongation of pregnancy. Conclusion: In women at risk for preterm labor, the detection of cervical funneling in the second trimester of pregnancy may help to predict preterm labor and to apply the appropriate treatment for its prevention. Although the use of cervical pessary was found to be more effective than cerclage, more studies are needed to classify the effectiveness of different methods for such prevention.

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In this study, there was a high prevalence of successful graft uptake following nasal dermoplasty. This technique may have potential for the control of recurrent nasal polyps. Although it is demanding and time-consuming, it may reduce the need for multiple operations. Further research is justified to establish its efficacy.

Schizophrenic patients given LSD-25 show an increase of psychopathological phenomena and a regression to the prime stage of their psychosis, the manifestations of which seem to be more directly related to the life history of the patients.∗ It has also been observed that some “normal” experimental subjects show various paranoid symptoms with the same drug, but whether these are in any way determined by heredity is not known.