00355nam a22001457a 4500003000400000020001800004082001400022100001400036245005000050250000900100260004300109300000900152650001300161653003500174SGT  a9789382219194  a610bP23P  aPark, K,   aPark's T.B. of Preventive and Social Medicine  a27th  bM/s Banarsidas Bhanot Publishersc2023  a1048  aMedicine  aPreventive and Social Medicine