function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Amorim, Dalton De Souza & Oliveira, Sarah Siqueira', 1],
    ['Banamar, Ouarda & Chandler, Peter J. & Driauach, Ouafaa', 1],
    ['Chandler, Peter J.', 3],
    ['Jakovlev, Jevgeni & Salmela, Jukka & Polevoi, Alexei', 10],
    ['Kolcsár, Levente-Péter & Salmela, Jukka', 2],
    ['Kurina, Olavi', 5],
    ['Kurina, Olavi & Ševčík, Jan', 12],
    ['Oliveira, Sarah Siqueira & Amorim, Dalton De Souza', 3],
    ['Pavlova, Aneliya', 2],
    ['Polevoi, A. V. & Potapova, N. K.', 1],
    ['Sevcik, Jan & Kasprak, David & Rulik, Bjoern', 1],
    ['Ševčík, Jan & Burdíková, Nikola & Kaspřák, David & Kurina, Olavi', 12]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=53)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);