GSTM1 and anemia (phenotype): The Hbmeter software was adopted to analyze photographs, and the following data were set: Hb < 10.5 g/dL: highly suspected anemia, 10.5 g/dL < Hb < 11.5 g/dL: suspected anemia, and Hb > 11.5 g/dL: low probability of anemia.