The authors declare no conflicts of interest. The maternal and infant mortality data that support the findings of this study are available from the Instituto Nacional de Estadística y Censo de Panamá (INEC) and the Pan American Health Organization (PAHO), reference numbers 6 and # respectively. These data were derived from the following resources available in the public domain https: //www. inec. gob. pa/publicaciones/Default2. aspx? IDCATEGORIA=3&IDSUBCATEGORIA=7 and https: //immunizationdata. who. int/global/wiisedetailpage/bacillus-calmette-gu%C3%A9rin- (bcg) -vaccination-coverage? CODE=PAN&YEAR=, respectively. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Amores et al. (Sun,) studied this question.