Introduction: Thyroid disease is the worlds second most frequent endocrine condition after diabetes. Nearly 300 million individuals worldwide are affected. Moreover, approximately 60% of people with thyroid completely unaware their medical condition. might have been an underlying leading to death, even if its not primary cause death. Methods: This type research descriptive a retrospective study...

Article history: Received 17 March 2011 Available online xxxx JEL classification: C72 C73

Article history: Received 14 April 2009 Available online xxxx JEL classification: C72 C73

Article history: Received 4 October 2010 Available online 9 November 2010 JEL classification: C70 C72 C73

Article history: Received 8 March 2006 Available online 17 October 2008 JEL classification: C61 C72 C73

Article history: Received 3 June 2011 Available online 17 October 2013 JEL classification: C73 D83 O32

We study the design of voting rules for committees representing heterogeneous groups (countries, states, districts) when cooperation among is voluntary. While efficiency recommends weighting proportionally to their stakes, we show that accounting participation constraints entails overweighting some groups, those which incentive cooperate lowest. When collective decisions are not enforceable, in...

Article history: Received 11 June 2009 Available online 16 September 2010 JEL classification: C02 C73

Article history: Received 28 September 2005 Available online 30 November 2008 JEL classification: C72 C73