The data for this study comes from the seventh round of the IDHS conducted in 2012 by Statistics Indonesia (Badan Pusat Statistik – BPS) in collaboration with the National Population and Family Planning Board (BKKBN) and the Indonesia Ministry of Health (MoH). This study is a further analysis of a publicly available de-identified secondary data. We download the dataset from the DHS program website after obtaining permission. Hence, we deem that a further ethical review is unnecessary.