In the journal, "THE TRANSITION FROM GEL SEPARATORY SERUM TUBES TO LITHIUM HEPARIN GEL TUBES IN THE CLINICAL LABORATORY" by Oğuzhan Zengi, how do the results of Bland-Altman plots and regression analysis contribute to our understanding of the comparability between serum tubes and LIH tubes for different clinical chemistry and immunoassay tests, and what implications do these findings have for clinical practice?