“…The results of 12 studies were rejected and not considered for further analysis, and the reasons for their removal are given in parentheses: Aleksandrov et al (1988) (data systematically too low) [57], Brun et al (1962) (no numerical values available in reference, high and scattered data) [58], Gauvin et al (1962) (data systematically shifted to higher energy) [59], Grütter (1982) (data systematically too low) [60], Hintz and Ramsey (1952) (data too high) [61], Korteling and Caretto (1970) (data too low) [62], Miyano (1973) (no numerical data available in reference) [63], Pulfer (1979) (data systematically low and scattered) [64] , Titarenko et al (2011) (unexplained wide spread of data) [65], Vukolov and Chukreev (1988) (values too high) [66], Walton et al (1976) (data systematically too low) [67], and Williams and Fulmer (1967) (no numerical data available in reference) [68].…”