Abstract
The process of revising the protocol, based on experience in the pilot phase and logical considerations, was conducted by working groups composed of persons directly involved with the field collection of data and professionals who were experts in specific disciplines although not part of the actual pilot research. Four of the working groups addressed the revision of the specific batteries of questions and measures in the protocol, while the fifth group addressed the sample size and sampling frame. The process led to consolidating and condensing many of the questions into single-line items, to recommendations for some additional questions based on common experience, to requirements for standardization of procedures and measuring instruments, and to explicit sequences for enrolling the population. This effort resulted in the revised protocol