function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bechev, Dimitar & Koç, Hasan', 4],
    ['Chandler, Peter J.', 1],
    ['Jakovlev, Jevgeni & Salmela, Jukka & Polevoi, Alexei', 6],
    ['Kjaerandsen, Jostein & Martinsson, Svante & Hedmark, Kjell', 8],
    ['Kolcsár, Levente-Péter & Salmela, Jukka', 1],
    ['Kurina, Olavi', 1],
    ['Zhu, Yi & Huang, Junhao & Liu, Liwei & Qi, Lei & Wang, Yang', 20]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=41)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);