“Tailoring axial intensity of laser beams with a heart-shaped hole,” by Wang et al: comment

Some comments about the recently published Optics Letters paper "Tailoring axial intensity of laser beams with a heart-shaped hole," by Wang et al., Opt. Lett.42, 4921 (2017)OPLEDP0146-959210.1364/OL.42.004921, are provided.