screw-retained implant restorations have an advantage of predictable retention as well as retrievability, and obviate the risk of excessive sub-gingival cement commonly associated with cement retained implant restorations. screw-retained restorations generally have screw access holes, which can compromise esthetics and weaken the porcelain around the holes. the purpose of this study is to descr...

Conditional Poisson models have been used to analyze vaccine safety data from self-controlled case series (SCCS) design. In this paper, we derived the likelihood function of fixed effects models in analyzing SCCS data and showed that the likelihoods from fixed effects models and conditional Poisson models were proportional. Thus, the maximum likelihood estimates (MLEs) of time-varying variables...

We empirically estimate the substitutability of fixed and mobile services for telecommunications access using a large, U.S. household survey conducted over the period 1999-2001. We take advantage of telephone price subsidy programs for low-income households to identify large, exogenous changes in fixed service prices to find substantial demand substitutability between fixed and mobile subscript...

the purpose of this study is to evaluate the effect of globalization on the cost of capital accepted companies in tehran stock exchange (tse(. in this regard, the degree of trade openness as an index the globalization of trade and other control variables such as firm size, the ratio of fixed assets to total assets, instantaneous ratio and the ratio of debts to total of equity has been used for ...