“…These studies were grouped by their system of research. The most commonly studied system of research was blood cells (9) [40], [41], [42], [43], [44], [45], [46], [47], [48] followed by whole body (8) [49], [50], [51], [52], [53], [54], [55], [56], blood plasma (4) [39], [57], [58], [59], tissues (2) [60], [61], urine (2) [62], [63], saliva (1) [64], and other cells (1) [65].…”