Personalized reference intervals: Using estimates of within-subject or within-person biological variation requires different statistical approaches - Coskun, Abdurrahman; Sandberg, Sverre; Unsal, Ibrahim; Cavusoglu, Coskun; Serteser, Mustafa; Kilercik, Meltem; Aarsand, Aasne K. (Clinica chimica acta, 2022)