Barriers to childhood vaccination in urban slums of Pakistan. - Muhammad A; Ahmad D; Tariq E; Yunus S; Warsi S; Hasmat L; Khawar H; Jimenez M; Ashraf M; Shafiq Y (Eastern Mediterranean health journal = La revue de sante de la Mediterranee orientale = al-Majallah al-sihhiyah li-sharq al-mutawassit, 2023)