Which group was ruled by two chiefs

Similarities between spain and the us? in terms of culture, foods, people, schedules, holidays, anything.

The procedures for reporting potential unanticipated problems involving risk to subjects or others to the irb are: stated in the human subject protection regulations, but not in the drug or device regulationsincluded in the consent processdetermined by research staffdetermined by the institution in its written policies and procedures

Why would it be hard to live in a city state