function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bertolani, Roberto', 1],
    ['Bertolani, Roberto & Bartels, Paul J. & Guidetti, Roberto', 2],
    ['Kaczmarek, Łukasz', 1],
    ['Kaczmarek, Łukasz & Bartels, Paul J. & Roszkowska, Milena', 1],
    ['Kaczmarek, Łukasz & Bertolani, Roberto', 1],
    ['Kaczmarek, Łukasz & Michalczyk, Łukasz', 1],
    ['Kaczmarek, Łukasz & Michalczyk, Łukasz & Mcinnes, Sandra J.', 1],
    ['Pilato, Giovanni & Lisi, Oscar & Binda, Maria Grazia', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=9)',
    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);