31 c. Written expert opinion mathematician19 of Bernardo Morales Figueroa, a The lost earnings of Myrna Mack Chang add up to US$949,934.78. This result was obtained applying the customary method of establishing the present value of an accrued amount of capital, adding the factor of professional experience. If one applies the method used by the Inter-American Court to determine lost earnings, the result would be US$561,384.64, so there is a difference of US$388,050.14 with respect to the calculation in his expert opinion. This arises from the differences in the terminal year of life expectancy, from not using average values but rather present values, operating in constant terms and carrying forward the information with the consumer price indexes, adding the use of the factor of professional maturity. B) TESTIMONIAL AND EXPERT EVIDENCE 127. The Court heard the testimony of the witnesses and the expert opinions of the expert witnesses proposed by the Commission and by the representatives of the next of kin of the victim (supra para. 43). The Court will now summarize the significant parts of said statements. a. Testimony of Monsignor Julio Cabrera Ovalle, Guatemalan bishop20 He is the Bishop of the Diocese of Jalapa, in Guatemala, and during the time of the facts he was the Bishop of Quiché, a position he held fro 15 years, starting in 1987. During the domestic armed conflict in Guatemala, the Diocese of Quiché had the largest population of internally displaced persons and of refugees in Mexico of all the country, and for this reason he decided to seek more information on this phenomenon. He met with Myrna Mack Chang for the first time on August 21, 1989. At that time, she was conducting a research study on the situation of internally displaced persons in the country, as part of her work as a social investigator for AVANCSO. At the time of the facts, Myrna Mack Chang was the only person investigating that specific topic, which had serious political implications, because while the armed conflict was a public matter, the Army sought to maintain secrecy regarding the way it treated the civilian population, especially the population of Quiché. He began to have problems with the Army when he interacted with said population. 19 A Guatemalan national. He is a civil engineer and has a licentiate degree in mathematics. He rendered an expert opinion in writing on January 4, 2003 before a notary public on the reparations requested by the Mack Chang family. 20 He rendered testimony on his knowledge of the alleged victim and the circumstances of her death, [and on] her work with the displaced population and other background pertaining to the object and purpose of the application.