function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hajiqanbar, Hamidreza & Arjomandi, Elham', 1],
    ['Jagersbacher-Baumann, Julia & Ebermann, Ernst', 1],
    ['Khaustov, A.', 3],
    ['Khaustov, Alexander A.', 4],
    ['Khaustov, Alexander A. & Minor, Maria A.', 2],
    ['Mahunka, Sandór Dr.', 1],
    ['Navabi, Amin & Hajiqanbar, Hamidreza & Mortazavi, Abdolazim', 6],
    ['Rahiminejad, Vahid & Hajiqanbar, Hamidreza', 1],
    ['Rahiminejad, Vahid & Hakimitabar, Masoud & Davari, Milad', 2],
    ['Rahiminejad, Vahid & Nadimi, Ahmad & Seyedein, Sarina', 4],
    ['Willmann, C.', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);