function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Itang, Lowelyn A. M. & Stec, Daniel & Mapalo, Marc A.', 1],
    ['Kaczmarek, Łukasz', 8],
    ['Mapalo, Marc A. & Stec, Daniel & Mirano-Bascos, Denise', 2],
    ['Roszkowska, Milena & Stec, Daniel & Ciobanu, Daniel Adrian', 2],
    ['Roszkowska, Milena & Stec, Daniel & Gawlak, Magdalena', 1],
    ['Stec, Daniel', 1],
    ['Stec, Daniel & Kristensen, Reinhardt Møbjerg', 1],
    ['Tumanov, Denis V.', 1],
    ['Tumanov, Denis V. & Pilato, Giovanni', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);