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From the selected point the survey group started moving northwards to find the first tent in the first cluster in the section. Following that, the group interviewed seven consecutive households living in the tents.

Then the group continued their way at least about 500 meters forward and then turned left at the nearest minor street or alley to find the first tent in the second cluster. Again, they interviewed seven consecutive households living in tents.

Five hundreds meters was considered in accordance with the limited physical ability and fitness level of group members, especially females, to walk after completing the first cluster.

The supporting idea for including the minor streets and alleys residents along with the main streets ones was the possible differences between their accessibility to health care services or opium abuse.