function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ghahari, H. & Havaskary, M. & Tabari, M. & Ostovan, H.', 1],
    ['Massa, Bruno', 1],
    ['Roy, Roger', 2],
    ['Taylan, Mehmet Sait & Şirin, Deniz & Sevgili, Hasan', 1],
    ['Temreshev, Izbasar I. & Makezhanov, Arman M.', 3],
    ['Tlili, Haithem & Abdellaoui, Khemais', 4],
    ['Usmani, Mohammad Kamil', 4],
    ['Wandji, Alain Christel & Yetchom-Fondjo, Jeanne Agrippine', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);